1,385 research outputs found
Heat Capacity Studies Of Ce And Rh Site Substitution In The Heavy-fermion Antiferromagnet Cerhin5: Short-range Magnetic Interactions And Non-fermi-liquid Behavior
No full textIn heavy fermion materials superconductivity tends to appear when long-range magnetic order is suppressed by chemical doping or applying pressure. Here we report heat capacity measurements on diluted alloys of the heavy fermion superconductor CeRhIn5. Heat capacity measurements have been performed on CeRh1-yIryIn5 (y≤0.10) and Ce1-xLaxRhIn5 (x≤0.50) in applied fields up to 90 kOe to study the effect of doping and magnetic field on the magnetic ground state. The magnetic phase diagram of CeRh09Ir 0.1Ir5 is consistent with the magnetic structure of CeRhIn5 being unchanged by Ir doping. Doping of Ir in small concentrations is shown to slightly increase the antiferromagnetic transition temperature TN (TN=3.8 K in the undoped sample). La doping which causes disorder on the Ce sublattice is shown to lower T N with no long-range order observed above 0.34 K for Ce 0.50La0.50RhIn5. Measurements on Ce 0.50La0.50RhIn5 show a coexistence of short-range magnetic order and non-Fermi-liquid behavior. This dual nature of the Ce 4f electrons is very similar to the observed results on CeRhIn 5 when long-range magnetic order is suppressed at high pressure.692244191244198Steglich, F., Aarts, J., Bredl, C.D., Lieke, W., Meschede, D., Franz, W., Schäfer, H., (1979) Phys. Rev. Lett., 43, p. 1892Jaccard, D., Behina, K., Sierro, J., (1992) Phys. Lett. A, 163, p. 475Movshovich, R., Graf, T., Mandrus, D., Thompson, J.D., Smith, J.L., Fisk, Z., (1996) Phys. Rev. B, 53, p. 8241Grosche, F.M., Julian, S.R., Mathur, N.D., Lonzarich, G.G., (1996) Physica B, 223-224, p. 50Mathur, N.D., Grosche, F.M., Julian, S.R., Walker, I.R., Freye, D.M., Haselwimmer, R.K., Lonzarich, G.G., (1998) Nature (London), 394, p. 39Hegger, H., Petrovic, C., Moshopoulou, E.G., Hundley, M.F., Sarrao, J.L., Fisk, Z., Thompson, J.D., (2000) Phys. Rev. Lett., 84, p. 4986Cornelius, A.L., Arko, A.J., Sarrao, J.L., Hundley, M.F., Fisk, Z., (2000) Phys. Rev. B, 62, p. 14181Fisher, R.A., Bouquet, F., Phillips, N.E., Hundley, M.F., Pagliuso, P.G., Sarrao, J.L., Fisk, Z., Thompson, J.D., (2002) Phys. Rev. B, 65, p. 224509Mito, T., Kawasaki, S., Zheng, G.Q., Kawasaki, Y., Ishida, K., Kitaoka, Y., Aoki, D., Onuki, Y., (2001) Phys. Rev. B, 63, pp. 220507RMito, Y., Kawasaki, S., Kawasaki, Y., Zheng, G.-Q., Kitaoka, Y., Aoki, D., Haga, Y., Onuki, Y., (2003) Phys. Rev. Lett., 90, p. 077004Petrovic, C., Pagliuso, P.G., Hundley, M.F., Movshovich, R., Sarrao, J.L., Thompson, J.D., Fisk, Z., Monthoux, P., (2001) J. Phys.: Condens. Matter, 13, pp. L337Petrovic, C., Movshovich, R., Jaime, M., Pagliuso, P.G., Hundley, M.F., Sarrao, J.L., Fisk, Z., Thompson, J.D., (2001) Europhys. Lett., 53, p. 354Pagliuso, P.G., Petrovic, C., Movshovich, R., Hall, D., Hundley, M.F., Sarrao, J.L., Thompson, J.D., Fisk, Z., (2001) Phys. Rev. B, 64, pp. 100503RCurro, N.J., Hammel, P.C., Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Fisk, Z., (2000) Phys. Rev. B, 62, pp. R6100Bao, W., Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Fisk, Z., Lynn, J.W., Erwin, R.W., (2000) Phys. Rev. B, 62, pp. R14621Bao, W., Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Fisk, Z., Lynn, J.W., Erwin, R.W., (2003) Phys. Rev. B, 67, pp. 099903EPagliuso, P.G., Moreno, N.O., Curro, N.J., Thompson, J.D., Hundley, M.F., Sarrao, J.L., Fisk, Z., Cornelius, A.L., (2002) Phys. Rev. B, 66, p. 054433Cornelius, A.L., Lawrence, J.M., Ebihara, T., Riseborough, P.S., Booth, C.H., Hundley, M.F., Pagliuso, P.G., Kwei, G.H., (2002) Phys. Rev. Lett., 88, p. 117201Ebihara, T., Bauer, E.D., Cornelius, A.L., Lawrence, J.M., Harrison, N., Thompson, J.D., Sarrao, J.L., Uji, S., (2003) Phys. Rev. Lett., 90, p. 166404Nakatsuji, S., Yeo, S., Balicas, L., Fisk, Z., Schlottmann, P., Pagliuso, P.G., Moreno, N.O., Thompson, J.D., (2002) Phys. Rev. Lett., 89, p. 106402Nakatsuji, S., Pines, D., Fisk, Z., cond-mat/0304587 (unpublished)Moshopoulou, E.G., Fisk, Z., Sarrao, J.L., Thompson, J.D., (2001) J. Solid State Chem., 158, p. 25Grin, Y.N., Yarmolyuk, Y.P., Gladyshevskii, E.I., (1979) Kristallografiya, 24, p. 242(1979) Sov. Phys. Crystallogr., 24, p. 137Grin, Y.N., Rogl, P., Hiebl, K., (1986) J. Less-Common Met., 121, p. 497Bredl, C.D., (1987) J. Magn. Magn. Mater., 63-64, p. 355Van Dijk, N.H., Bourdarot, F., Klaasse, J.P., Hagmusa, I.H., Bruck, E., Menovsky, A.A., (1997) Phys. Rev. B, 56, p. 14493Murayama, S., Sekine, C., Yokoyanagi, A., Onuki, Y., (1997) Phys. Rev. B, 56, p. 11092Lees, M.R., Petrenko, O.A., Balakrishnan, G., Paul, D.M., (1999) Phys. Rev. B, 59, p. 1298noteCornelius, A.L., Pagliuso, P.G., Hundley, M.F., Sarrao, J.L., (2001) Phys. Rev. B, 64, p. 144411Takeuchi, T., Inoue, T., Sugiyama, K., Aoki, D., Tokiwa, Y., Haga, Y., Kindo, K., Onuki, Y., (2001) J. Phys. Soc. Jpn., 70, p. 877Pagliuso, P.G., Curro, N.J., Moreno, N.O., Hundley, M.F., Thompson, J.D., Sarrao, J.L., Fisk, Z., (2002) Physica B, 320, p. 370Christianson, A.D., Lawrence, J.M., Pagliuso, P.G., Moreno, N.O., Sarrao, J.L., Thompson, J.D., Riseborough, P.S., Lacerda, A.H., (2002) Phys. Rev. B, 66, p. 193102Bao, W., Christianson, A.D., Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Lacerda, A.H., Lynn, J.W., (2002) Physica B, 312-313, p. 120Monthoux, P., Lonzarich, G.G., (2001) Phys. Rev. B, 63, p. 054529Stewart, G.R., (1984) Rev. Mod. Phys., 56, p. 755Llobet, A., Gardner, J.S., Moshopoulou, E.C., Mignot, J.M., Nicklas, M., Bao, W., Moreno, N.O., Thompson, J.D., cond-mat/0307055 (unpublished)Bao, W., private CommunicationKim, J.S., Alwood, J., Mixson, D., Watts, P., Stewart, G.R., (2002) Phys. Rev. B, 66, p. 134418Zapf, V.S., Frederick, N.A., Rogers, K.L., Hof, K.D., Ho, P.-C., Bauer, E.D., Maple, M.B., (2003) Phys. Rev. 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Crystal Structure And Low Temperature Physical Properties Of Ho2 Co Ga8 Intermetallic Antiferromagnet
No full textWe have synthesized single crystalline samples of Ho2 Co Ga8 intermetallic compound using a Ga-flux method. This compound crystallizes with a tetragonal structure, space group P4mmm, and lattice parameters a=4.219 (5) Å and c=10.99 (2) Å. This structure is a bilayer version of the HoCo Ga5 (1-1-5) which hosts a series of heavy-fermion superconductors and complex antiferromagnetic intermetallic systems. Measurements of magnetic susceptibility, heat capacity, and electrical resistivity revealed that Ho2 Co Ga8 is a metallic Curie-Weiss paramagnet at high temperature and presents an antiferromagnetic ordering below TN ∼5 K. The low temperature magnetic properties of this compound show the effects of tetragonal crystalline electrical field and the Ruderman-Kittel-Kasuya-Yosid interactions and the results presented here are compared with a broader description of the evolution of the low- T magnetic properties of structurally related series of rare-earth based tetragonal 2-1-8 and 1-1-5 compounds. © 2008 American Institute of Physics.1037Continentino, M.A., V. Löhneysen, H., Rosch, A., Vojta, M., Wölfle, P., (2005) Braz. J. Phys., 35, p. 197. , 0103-9733 10.1590/S0103-97332005000100018, ();, Rev. Mod. Phys. 79, 1015 (2007)Thompson, J.D., Movshovich, R., Fisk, Z., Bouquet, F., Curro, N.J., Fisher, R.A., Hammel, P.C., Sarrao, J.L., (2001) J. Magn. Magn. Mater., 226-230, p. 5. , and references thereinPagliuso, P.G., Movshovich, R., Bianchi, A.D., Nicklas, M., Moreno, N.O., Thompson, J.D., Hundley, M.F., Fisk, Z., (2002) Physica B, 312-313, p. 129Moreno, N.O., Hundley, M.F., Pagliuso, P.G., Movshovich, R., Nicklas, M., Thompson, J.D., Sarrao, J.L., Fisk, Z., (2002) Physica B, 312-313, p. 274Bianchi, A., Movshovich, R., Vekhter, I., Pagliuso, P.G., Sarrao, J.L., (2003) Phys. Rev. Lett., 91, p. 257001Sarrao, J.L., Morales, L.A., Thompson, J.D., Scott, B.L., Stewart, G.R., Wastin, F., Rebizant, J., Lander, G.H., (2002) Nature (London), 420, p. 297Bauer, E.D., Thompson, J.D., Sarrao, J.L., Morales, L.A., Wastin, F., Rebizant, J., Griveau, J.C., Stewart, G.R., (2004) Phys. Rev. Lett., 93, p. 147005Pagliuso, P.G., Garcia, D.J., Miranda, E., Granado, E., Lora-Serrano, R., Giles, C., Duque, J.G.S., Rettori, C., (2006) J. Appl. Phys., 99, pp. 08P703. , and references thereinGranado, E., Uchoa, B., Malachias, A., Lora-Serrano, R., Pagliuso, P.G., Westfahl Jr., H., (2006) Phys. Rev. B, 74, p. 214428Lora-Serrano, R., Giles, C., Granado, E., Garcia, D.J., Miranda, E., Agüero, O., Mendoņa Ferreira, L., Pagliuso, P.G., (2006) Phys. Rev. B, 74, p. 214404Hieu, N.V., Shishido, H., Nakashima, H., Sugiyama, K., Settai, R., Takeuchi, T., Matsuda, T.D., Nuki, Y., (2007) J. Magn. Magn. Mater., 310, p. 1721Hudis, J., Hu, R., Broholm, C.L., Mitrovic, V.F., Petrovic, C., (2006) J. Magn. Magn. Mater., 307, p. 301Yokaichiya, F., Giles, C., (2004) Physica B, 345, p. 82Yu, G., Yarmolyuk, Ya.P., Gladyshevskii, E.I., (1979) Kristallografiya, 24, p. 242Bao, W., Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Fisk, Z., (2001) Phys. Rev. B, 64, p. 020401. , (R)Adriano, C., Lora-Serrano, R., Giles, C., De Bergevin, F., Lang, J.C., Srajer, G., Mazzoli, C., Pagliuso, P.G., (2007) Phys. Rev. B, 76, p. 104515Amara, M., Gaĺra, R.M., Morin, P., Voiron, J., Burlet, P., (1995) J. Magn. Magn. Mater., 140-144, p. 1157Kletowski, Z., Slawinski, P., (1990) Solid State Commun., 76, p. 867Czopnik, A., (1995) Phys. Status Solidi A, 147, p. 3
High Field Nuclear Magnetic Resonance In Transition Metal Substituted Bafe2as2
No full textWe report high field 75As nuclear magnetic resonance (NMR) measurements on Co and Cu substituted BaFe2As2 single crystals displaying same structural/magnetic transition T0?128 K. From our anisotropy studies in the paramagnetic state, we strikingly found virtually identical quadrupolar splitting and consequently the quadrupole frequency νQ?2.57(1) MHz for both compounds, despite the claim that each Cu delivers 2 extra 3d electrons in BaFe2As2 compared to Co substitution. These results allow us to conclude that a subtle change in the crystallographic structure, particularly in the Fe-As tetrahedra, must be the most probable tuning parameter to determine T0 in this class of superconductors rather than electronic doping. Furthermore, our NMR data around T0 suggest coexistence of tetragonal/paramagnetic and orthorhombic/antiferromagnetic phases between the structural and the spin density wave magnetic phase transitions, similarly to what was reported for K-doped BaFe2As2 [Urbano et al., Phys. Rev. Lett. 105, 107001 (2010)]. © 2014 AIP Publishing LLC.11517Urbano, R.R., Green, E.L., Moulton, W.G., Reyes, A.P., Kuhns, P.L., Bittar, E.M., Adriano, C., Pagliuso, P.G., (2010) Phys. Rev. Lett., 105, p. 107001. , 10.1103/PhysRevLett.105.107001Paglione, J., Greene, R.L., (2010) Nature Phys., 6, p. 645. , 10.1038/nphys1759Barzykin, V., Gor'Kov, L.P., (2009) Phys. Rev. B, 79, p. 134510. , 10.1103/PhysRevB.79.134510Granado, E., Mendonça Ferreira, L., Garcia, F., Azevedo D. G, M., Fabbris, G., Bittar, E.M., Adriano, C., Pagliuso, P.G., (2011) Phys. Rev. B, 83, p. 184508. , 10.1103/PhysRevB.83.184508Bittar, E.M., Adriano, C., Garitezi, T.M., Rosa, P.F.S., Mendonça Ferreira, L., Garcia, F., Azevedo D. G, M., Granado, E., (2011) Phys. Rev. Lett., 107, p. 267402. , 10.1103/PhysRevLett.107.267402Ideta, S., Yoshida, T., Nishi, I., Fujimori, A., Kotani, Y., Ono, K., Nakashima, Y., Arita, R., (2013) Phys. Rev. Lett., 110, p. 107007. , 10.1103/PhysRevLett.110.107007Yin, Z.P., Haule, K., Kotliar, G., (2011) Nature Mater., 10, p. 932. , 10.1038/nmat3120Rosa, P.F.S., Adriano, C., Iwamoto, W., Garitezi, T.M., Grant, T., Fisk, Z., Pagliuso, P.G., (2012) Phys. Rev. B, 86, p. 165131. , 10.1103/PhysRevB.86.165131Garitezi, T.M., Adriano, C., Rosa, P.F.S., Bittar, E.M., Bufaiçal, L., De Almeida, R.L., Granado, E., Pagliuso, P.G., (2013) Brazilian J. Phys., 43, p. 223. , 10.1007/s13538-013-0144-zRosa, P.F.S., Adriano, C., Garitezi, T.M., Grant, T., Fisk, Z., Urbano, R.R., Fernandes, E.R.R., Pagliuso, P.G., Unconventional superconductivity in substituted BaFe2As 2 revealed by pair-breaking studies Nature Scientific Reports, , (submitted)Ni, N., Thaler, A., Yan, J.Q., Kracher, A., Colombier, E., Bud'Ko, S.L., Canfield, P.C., Hannahs, S.T., (2010) Phys. Rev. B, 82, p. 024519. , 10.1103/PhysRevB.82.024519Urbano, R.R., Green, E.L., Moulton, W.G., Reyes, A.P., Kuhns, P.L., Bittar, E.M., Adriano, C., Pagliuso, P.G., (2011) J. Phys.: Conf. Ser., 273, p. 012107. , 10.1088/1742-6596/273/1/01210
Vibrational And Electronic Excitations In The (ce,la)m In5 (m=co,rh) Heavy-fermion Family
No full textWe present a systematic study at ambient pressure of the phononic and electronic Raman-active excitations in the ab plane of the (Ce,La)M In5 (M=Co,Rh) heavy-fermion family. We found that the characteristic Raman spectra of this family of compounds display two phonon modes at ∼38 and ∼165 cm-1 and a broad electronic background centered at ∼40 cm-1. For CeCoIn5, the temperature dependence of these excitations shows anomalous behavior near T* =45 K that may indicate a nontrivial renormalization of the electronic structure driven by strong correlations between hybridized 4f electrons. © 2007 The American Physical Society.754Heffner, R.H., Norman, M.R., (1996) Comments Condens. Matter Phys., 17, p. 361. , CCMPEB 0885-4483Anderson, P.W., (1961) Phys. Rev., 124, p. 41. , PHRVAO 0031-899X 10.1103/PhysRev.124.41Coqblin, B., Schrieffer, J.R., (1969) Phys. Rev., 185, p. 847. , PHRVAO 0031-899X 10.1103/PhysRev.185.847Rajan, V.T., (1983) Phys. Rev. Lett., 51, p. 308. , PRLTAO 0031-9007 10.1103/PhysRevLett.51.308Rossel, C., Yang, K.N., Maple, M.B., Fisk, Z., Zirngiebl, E., Thompson, J.D., (1987) Phys. Rev. B, 35, p. 1914. , See, for example, PRBMDO 0163-1829 10.1103/PhysRevB.35.1914Nakatsuji, S., Pines, D., Fisk, Z., (2004) Phys. Rev. Lett., 92, p. 016401. , PRLTAO 0031-9007 10.1103/PhysRevLett.92.016401Nakatsuji, S., Yeo, S., Balicas, L., Fisk, Z., Schlottmann, P., Pagliuso, P.G., Moreno, N.O., Thompson, J.D., (2002) Phys. Rev. Lett., 89, p. 106402. , PRLTAO 0031-9007 10.1103/PhysRevLett.89.106402Curro, N.J., Sarrao, J.L., Thompson, J.D., Pagliuso, P.G., Kos, Š., Abanov, At., Pines, D., (2003) Phys. Rev. Lett., 90, p. 227202. , PRLTAO 0031-9007 10.1103/PhysRevLett.90.227202Petrovic, C., Movshovich, R., Jaime, M., Pagliuso, P.G., Hundley, M.F., Sarrao, J.L., Fisk, Z., Thompson, J.D., (2001) Europhys. Lett., 53, p. 354. , EULEEJ 0295-5075 10.1209/epl/i2001-00161-8Petrovic, C., Pagliuso, P.G., Hundley, M.F., Movshovich, R., Sarrao, J.L., Fisk, Z., Thompson, J.D., (2001) J. Phys.: Condens. Matter, 13, p. 337. , JCOMEL 0953-8984 10.1088/0953-8984/13/17/103Sidorov, V.A., Nicklas, M., Pagliuso, P.G., Sarrao, J.L., Bang, Y., Balatsky, A.V., Thompson, J.D., (2002) Phys. Rev. Lett., 89, p. 157004. , PRLTAO 0031-9007 10.1103/PhysRevLett.89.157004Bianchi, A., Movshovich, R., Vekhter, I., Pagliuso, P.G., Sarrao, J.L., (2003) Phys. Rev. Lett., 91, p. 257001. , PRLTAO 0031-9007 10.1103/PhysRevLett.91.257001Bianchi, A., Movshovich, R., Capan, C., Pagliuso, P.G., Sarrao, J.L., (2003) Phys. Rev. Lett., 91, p. 187004. , PRLTAO 0031-9007 10.1103/PhysRevLett.91.187004Singley, E.J., Basov, D.N., Bauer, E.D., Maple, M.B., (2002) Phys. Rev. B, 65, p. 161101. , PRBMDO 0163-1829 10.1103/PhysRevB.65.161101Klein, M.V., (1983) Light Scattering in Solids I, 8, p. 147. , edited by M. Cardona, Topics in Applied Physics, Vol. Springer-Verlag, BerlinZawadowski, A., Cardona, M., (1990) Phys. Rev. B, 42, p. 10732. , PRBMDO 0163-1829 10.1103/PhysRevB.42.10732Menéndez, J., Cardona, M., (1984) Phys. Rev. B, 29, p. 2051. , PRBMDO 0163-1829 10.1103/PhysRevB.29.2051Harrison, N., (2004) Phys. Rev. Lett., 93, p. 186405. , PRLTAO 0031-9007 10.1103/PhysRevLett.93.186405Nayak, P., Ojha, B., Mohanty, S., Behera, S.N., (2002) Int. J. Mod. Phys. B, 16, p. 3595. , IJPBEV 0217-9792Hall, D., (2001) Phys. Rev. B, 64, p. 064506. , PRBMDO 0163-1829 10.1103/PhysRevB.64.064506Razafimandiby, H., Fulde, P., Keller, J., (1989) Z. Phys. B: Condens. Matter, 54, p. 111. , ZPCMDN 0722-3277 10.1007/BF01388062Christianson, A.D., (2004) Phys. Rev. B, 70, p. 134505. , PRBMDO 0163-1829 10.1103/PhysRevB.70.13450
Anomalous F-electron Hall Effect In The Heavy-fermion System Cetin 5 (t=co, Ir, Or Rh)
No full textThe in-plane Hall coefficient RH(T) of CeRhIn5, CeIrIn5, and CeCoIn5, and their respective nonmagnetic lanthanum analogs are reported in fields up to 90 kOe and at temperatures from 2-325 K. RH(T) is negative, field independent, and dominated by skew scattering above ∼50 K in the Ce compounds. RH(H → 0) becomes increasingly negative below 50 K and varies with temperature in a manner that is inconsistent with skew scattering. Field-dependent measurements show that the low-T anomaly is strongly suppressed when the applied field is increased to 90 kOe. Measurements on LaRhIn5, LaIrIn5, and LaCoIn5 indicate that the same anomalous temperature dependence is present in the Hall coefficient of these nonmagnetic analogs, albeit with a reduced amplitude and no field dependence. Hall angle (θH) measurements find that the ratio ρxx/ρxy). = cot(θH) varies as T2 below 20 K for all three Ce-115 compounds. The Hall angles of the La-115 compounds follow this T dependence as well. These data suggest that the electronic-structure contribution dominates the Hall effect in the 115 compounds, with f electron and Kondo interactions acting to magnify the influence of the underlying complex band structure. This is in stark contrast to the situation in most 4f and 5f heavy-fermion compounds where the normal carrier contribution to the Hall effect provides only a small, T-independent background to RH.703351131-035113-9Fisk, Z., Hess, D.W., Pethick, C.J., Pines, D., Smith, J.L., Thompson, J.D., Willis, J.O., (1988) Science, 239, p. 33Ott, H.R., Fisk, Z., (1987) Handbook on the Physics and Chemistry of Actinides, 5, p. 85. , edited by A. J. Freeman and G. H. Landers (North Holland, Amsterdam)Grewe, N., Steglich, F., (1991) Handbook on the Chemistry and Physics of Rare Earths, 14, p. 343. , edited by K. A. Gschneidner and L. Eyring (North Holland, Amsterdam)Fisk, Z., Sarrao, J.L., Smith, J.L., Thompson, J.D., (1995) Proc. Natl. Acad. Sci. 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Magnetic Structure Of R 2 Coga 8 (r = Gd, Tb, And Dy): Structural Tuning Of Magnetic Properties In Layered Ga-based Intermetallic Compounds
No full textIn this work we have determined the magnetic structure of R2CoGa8 (R= Gd, Tb, and Dy) intermetallic compounds using x-ray resonant magnetic scattering in order to study the evolution of the anisotropic magnetic properties along the series for R= Gd-Tm. The three compounds have a commensurate antiferromagnetic spin structure with a magnetic propagation vector τâ- = (12,12,12) and a Néel temperature of approximately 20, 28.5, and 15.2 K for R= Gd, Tb, and Dy, respectively. The critical exponent β obtained from the temperature dependence of the magnetic peaks suggest a three-dimensional universality class for the three compounds. Comparing the simulated and integrated intensities we conclude that the magnetic moment direction is in the ab plane for the Gd2CoGa8 compound and parallel to the c axis for the Tb2CoGa8 and Dy2CoGa8 compounds. The evolution of the magnetic properties of the R2CoGa8 series for R= Gd-Tm is discussed taking into account the indirect Ruderman-Kittel-Kasuya-Yoshida interaction and crystalline-electric field effects. The comparison between the reported magnetic properties of the Ga-based compounds with those for the In-based isostructural family reveals differences in their exchange couplings that contribute to the understanding of the role of the f-electron magnetism in these classes of materials. © 2014 American Physical Society.8911Thompson, J., Fisk, Z., (2012) J. Phys. Soc. Jpn., 81, p. 011002. , JUPSAU 0031-9015 10.1143/JPSJ.81.011002Movshovich, R., Jaime, M., Thompson, J.D., Petrovic, C., Fisk, Z., Pagliuso, P.G., Sarrao, J.L., (2001) Phys. Rev. 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Electron Spin Resonance Of The Half-heusler Antiferromagnet Gdpdbi
No full textWe present electron spin resonance (ESR) measurements at X-Band frequency (ν=9.5 GHz) in powdered single crystal of the half-Heusler antiferromagnet GdPdBi grown using a Bi-flux method. In the paramagnetic state, a single Gd 3+ Dysonian ESR line is observed with a nearly temperature independent g-factor of ≈1.99(2). On the other hand, the ESR linewidth ΔH increases non-linearly with decreasing temperature, indicating that the dominant relaxation mechanism occurs via Gd3+ spin-spin interaction. Approaching the AFM transition at TN ≈13 K, the Gd3+ ESR line shifts to higher fields due to the emergence of short-range AFM correlations. Complementary data from macroscopic measurements such as magnetic susceptibility, heat capacity and electrical resistivity measurements provide further details about the global macroscopic physical properties of the GdPdBi compound. © 2013 Elsevier Ltd.1779597Hodeau, J.L., Marezio, M., Remeika, J.P., Chen, C.H., (1982) Solid State Communications, 42, pp. 97-102Sato, H., Fukuhara, T., Iwakawa, S., Aoki, Y., Sakamoto, I., Takayanagi, S., Wada, N., (1993) Physica B, 186-188, pp. 630-632Hundley, M.F., Serrao, J.L., Thompson, J.D., Movshovich, R., Jaime, M., Petrovic, C., Fisk, Z., (2001) Physical Review B, 65, p. 024401Israel, C., Bittar, E.M., Agüero, O.E., Urbano, R.R., Rettori, C., Torriani, I., Pagliuso, P.G., Borges, H.A., (2005) Physica B, 359-361, pp. 251-253Rosa, P.F.S., Adriano, C., Iwamoto, W., Garitezi, T.M., Grant, T., Fisk, Z., Pagliuso, P.G., (2012) Physical Review B, 86, p. 165131Malachias, A., Granado, E., Lora-Serrano, R., Pagliuso, P.G., Perez, C.A., (2008) Physical Review B, 77, p. 094425. , references thereinKhmelevskyi, S., (2012) Physical Review B, 86, p. 104429Wunderlich, W., Motoyama, Y., (2009) Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications, 1128, pp. 21-26Sekimoto, T., Kurosaki, K., Muta, H., Yamanaka, S., (2007) Journal of Applied Physics, 102, p. 023705Tobola, J., Pierre, J., (2000) Journal of Alloys and Compounds, 296, pp. 243-252Feng, W., Xiao, D., Zhang, Y., Yao, Y., (2010) Physical Review B, 82, p. 235121Chadov, S., Qi, X., Kübler, J., Fecher, G.H., Felser, C., Zhang, S.C., (2010) Nature Materials, 9, pp. 541-545Lin, H., Wray, L.A., Xia, Y., Xu, S., Jia, S., Cava, R.J., Bansil, A., Hasan, M.Z., (2010) Nature Materials, 9, pp. 546-549Sekimoto, T., Kurosaki, K., Muta, H., Yamanaka, S., (2007) Materials Transactions, 48, pp. 2079-2082Gofryk, K., Kaczorowski, D., Plackowski, T., Leithe-Jasper, A., Grin, Y., (2011) Physical Review B, 84, p. 035208Pagliuso, P.G., Thompson, J.D., Hundley, M.F., Sarrao, J.L., Fisk, Z., (2001) Physical Review B, 63, p. 054426Granado, E., Pagliuso, P.G., Giles, C., Lora-Serrano, R., Yokaichiya, F., Sarrao, J.L., (2004) Physical Review B, 69, p. 144411Granado, E., Uchoa, B., Malachias, A., Lora-Serrano, R., Pagliuso, P.G., Westfahl, Jr.H., (2006) Physical Review B, 74, p. 214428Pires, M.A., Mendonça Ferreira, L., Duque, J.G.S., Urbano, R.R., Agüero, O., Torriani, I., Rettori, C., Pagliuso, P.G., (2006) Journal of Applied Physics, 99, pp. 08J311Duque, J.G.S., Adriano, C., Lora-Serrano, R., Rettori, C., Urbano, R.R., Sarrao, J.L., Oseroff, S.B., Pagliuso, P.G., (2008) Journal of Applied Physics, 103, pp. 07B733Duque, J.G.S., Miranda, E., Belon, A.M.O., Bufaiçal, L., Rettori, C., Pagliuso, P.G., (2007) Physica B Condensed Matter, 398, pp. 430-433Nakamura, H., Ito, K., Wada, H., Shiga, M., (1993) Physica B, 186-188, pp. 633-635Pagliuso, P.G., Sarrao, J.L., Thompson, J.D., Hundley, M.F., Sercheli, M.S., Urbano, R.R., Rettori, C., Oseroff, S.B., (2001) Physical Review B, 63, p. 092406Bouvier, M., Lethuillier, P., Schmitt, D., (1991) Physical Review B, 43, pp. 13137-13144Blanco, J.A., Gignoux, D., Schmitt, D., (1991) Physical Review B, 43, pp. 13145-13151Süllow, S., Prasad, I., Aronson, M.C., Sarrao, J.L., Fisk, Z., Hristova, D., Lacerda, A.H., Gibbs, D., (1988) Physical Review B, 57, p. 5860Feher, G., Kip, A.F., (1955) Physical Review, 98, pp. 337-348Dyson, F.J., (1955) Physical Review, 98, pp. 349-359Abragam, A., Bleaney, B., (1970) EPR of Transition Ions, , Clarendon Press OxfordRettori, C., Kim, H.M., Chock, E.P., Davidov, D., (1974) Physical Review B, 10, pp. 1826-1835. , references thereinZhid Hasan, M., Moore, J.E., (2011) Annual Review of Condensed Matter Physics, 2, pp. 55-78Butch, N.P., Syers, P., Kirshenbaum, K., Hope, A.P., Paglione, J., (2011) Physical Review B, 84, pp. 220504
Cd Doping Effects In The Heavy-fermion Compounds Ce2 Min 8 ( M=rh And Ir)
No full textLow-temperature magnetic properties of Cd-doped Ce2 M In 8 (M=Rh and Ir) single crystals are investigated. Experiments of temperature-dependent magnetic-susceptibility, heat-capacity, and electrical-resistivity measurements revealed that Cd doping enhances the antiferromagnetic (AFM) ordering temperature from TN =2.8 K (x=0) to TN =4.8 K (x=0.21) for Ce2 RhIn8-x Cd x and induces long-range AFM ordering with TN =3.8 K (x=0.21) for Ce2 IrIn8-x Cdx. Additionally, x-ray and neutron magnetic scattering studies showed that Cd-doped samples present below TN a commensurate antiferromagnetic structure with a propagation vector ε→ = (1/2, 1/2, 0). The resolved magnetic structures for both compounds indicate that the Cd doping tends to rotate the direction of the ordered magnetic moments toward the ab plane. This result suggests that the Cd doping affects the Ce3+ ground-state single-ion anisotropy modifying the crystalline electrical field (CEF) parameters at the Ce3+ site. Indications of CEF evolution induced by Cd doping were also found in the electrical-resistivity measurements. Comparisons between our results and the general effects of Cd doping on the related compounds CeMIn 5 (M=Co, Rh, and Ir) confirms the claims that the Cd doping induced electronic tuning is the main effect favoring AFM ordering in these compounds. © 2010 The American Physical Society.8124Monthoux, P., Lonzarich, G.G., (1999) Phys. Rev. B, 59, p. 14598. , 10.1103/PhysRevB.59.14598;Hilbert Löhneysen, V., Rosch, A., Vojta, M., Wölfle, P., (2007) Rev. Mod. 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Magnetic Structure And Critical Behavior Of Gdrh In5: Resonant X-ray Diffraction And Renormalization Group Analysis
No full textThe magnetic structure and fluctuations of tetragonal GdRh In5 were studied by resonant x-ray diffraction at the Gd LII and LIII edges, followed by a renormalization group analysis for this and other related Gd-based compounds, namely Gd2 Ir In8 and Gd In3. These compounds are spin-only analogs of the isostructural Ce-based heavy-fermion superconductors. The ground state of GdRh In5 shows a commensurate antiferromagnetic spin structure with propagation vector τ = (0, 1 2, 1 2), corresponding to a parallel spin propagation along the a direction and antiparallel propagation along b and c. The spin direction lies along a. A comparison between this magnetic structure and those of other members of the Rm (Co,Rh,Ir)n In3m+2n family (R=rare earth, n=0,1; m=1,2) indicates that, in general, τ is determined by a competition between first- (J1) and second-neighbor (J2) antiferromagnetic (AFM) interactions. While a large J1 J2 ratio favors an antiparallel alignment along the three directions (the G -AFM structure), a smaller ratio favors the magnetic structure of GdRh In5 (C -AFM). In particular, it is inferred that the heavy-fermion superconductor CeRh In5 is in the frontier between these two ground states, which may explain its noncollinear spiral magnetic structure. The critical behavior of GdRh In5 close to the paramagnetic transition at TN =39 K was also studied in detail. A typical second-order transition with the ordered magnetization critical parameter β=0.35 was experimentally found, and theoretically investigated by means of a renormalization group analysis. 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Magnetic Structure And Enhanced Tn Of The Rare-earth Intermetallic Compound Tbrh In5: Experiments And Mean-field Model
No full textIn this work the physical properties of the intermetallic compound TbRh In5 were investigated by means of temperature-dependent magnetic susceptibility, electrical resistivity, heat-capacity, and resonant x-ray magnetic diffraction experiments. TbRh In5 is an intermetallic compound that orders antiferromagnetically at TN =45.5 K, the highest ordering temperature among the existing RRh In5 (1-1-5, R=rare earth) materials, which in contrast to what is expected from a de Gennes scaling along the RRh In5 series. The x-ray resonant diffraction data have allowed us to solve the magnetic structure of TbRh In5. Below TN, we found a commensurate antiferromagnetic structure with a propagation vector (12,0,12) and the Tb moments oriented along the c axis. Strong (over two orders of magnitude) dipolar enhancements of the magnetic Bragg peaks were observed at both Tb absorption edges LII and LIII, indicating a fairly high polarization of the Tb 5d levels. 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