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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 Cerhin5 As A Function Of Pressure And Temperature
Full text linkWe report magnetic neutron-diffraction and electrical resistivity studies on single crystals of the heavy-fermion antiferromagnet CeRhIn5 at pressures up to 2.3 GPa. These experiments show that the staggered moment of Ce and the incommensurate magnetic structure change weakly with applied pressure up to 1.63 GPa, where resistivity, specific heat and nuclear quadrupole resonance measurements confirm the presence of bulk superconductivity. This work places important constraints on an interpretation of the relationship between antiferromagnetism and unconventional superconductivity in CeRhIn 5.692244031244036Heffner, R.H., Norman, M.R., (1996) Comments Condens. Matter Phys., 17, p. 361Stewart, G.R., (2001) Rev. Mod. 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Rev. Lett., 86, p. 4664Movshovich, R., Jaime, M., Thompson, J.D., Petrovic, C., Fisk, Z., Pagliuso, P.G., Sarrao, J.L., (2001) Phys. Rev. Lett., 86, p. 5152Fisher, 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. 224509Kawasaki, S., Mito, T., Kawasaki, Y., Zheng, G.-Q., Kitaoka, Y., Aoki, D., Haga, Y., Onuki, Y., cond-mat/0303123 (unpublished)Mito, T., Kawasaki, S., Zheng, G.-Q., Kawasaki, Y., Ishida, K., Kitaoka, Y., Aoki, D., Onuki, Y., (2001) Phys. Rev. B, 63, p. 220507Mito, T., Kawasaki, S., Zheng, G.-Q., Kawasaki, Y., Ishida, K., Kitaoka, Y., Aoki, D., Onuki, Y., (2002) Physica B, 312-313, p. 16Izawa, K., Yamaguchi, H., Matsuda, Y., Shishido, H., Settai, R., Onuki, Y., (2001) Phys. Rev. Lett., 87, p. 057002Pagliuso, P.G., Petrovic, C., Movshovich, R., Hall, D., Hundley, M.F., Sarrao, J.L., Thompson, J.D., Fisk, Z., (2001) Phys. Rev. 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Thermal Expansion And Magnetovolume Effects In The Heavy-fermion System Ce2rhin8
No full textWe present the results of thermal expansion α(T), nagnetostriction λ(H,T), and specific-heat Cp(T) measurements made on the heavy-fermion antiferromagnet Ce2RhIn8. The effects of magnetic order are clearly evident as anomalies in α(T) at T N=2.8 K and at Tm = 1.65 K. Cp(T) data indicate that the upper transition corresponds to the onset of long-range antiferromagnetic order while the lower transition involves only a subtle rearrangement of the ordered state. Both Cp/T and α/T grow with decreasing temperature below 20 K in a manner consistent with Kondo renormalization. Kondo interactions appear to be responsible for the large electronic Grüneisen parameter which extrapolates to ωe ≈ 48 as T→0, while the characteristic Kondo energy is TK ≈ 10 K as determined from the Cp/T ratio at TN. Above 20 K α(T) is dominated by crystalline-electricfield (CEF) effects. The data are consistent with a CEF level scheme consisting of excited γ 7 (1) and γ6 doublets lying 71±6 K and 195±10 K above a γ7 (2) ground state. In the paramagnetic state (T > TN) the volume magnetostriction follows a simple scaling law, λ∝[H/(T+ Tλ)] 2. The scaling parameter Tλ=5 K is consistent with the Kondo temperature determined from α(T) and Cp(T) data. Analysis of λ(H,T) data also indicates that the magnetic and electronic energy scales associated with the Kondo state in Ce2RhIn8 are equivalent. These thermodynamic data indicate that the physical properties of Ce2RhIn8 result from competition between magnetic exchange, Kondo, and CEF interactions.6818184419118441912Grewe, N., Steglich, F., (1991) Handbook on the Physics and Chemistry of Rare Earth, 14, p. 343. , edited by K. A. Gschneider, Jr. and L. Eyring (Elsevier, Amsterdam)Doniach, S., (1977) Valance Instabilities and Related Narrow Band Phenomena, p. 169. , edited by R. D. 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Going Beyond Counting First Authors in Author Co-citation Analysis
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only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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