1,720,962 research outputs found
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
Transport Critical Current Measurements On A Cu-substituted Bafe 2as2 Superconductor
No full textThe critical current density Jc is a crucial parameter to establish the actual technological potential of a superconducting (SC) material. Furthermore, being proportional to the SC gap parameter, it can reveal important information about the microscopic nature of the SC state in a given material. The FeAs-based class of SC materials has been a focus of intense scientific investigation lately, but direct investigation of Jc by transport measurements is rather scarce in literature. For these materials, it is very interesting to map Jc as a function of their distinct SC tuning parameters such as applied pressure and chemical substitution. In this work, detailed investigation of the field, temperature, and pressure dependences of transport critical current density Jc for Cu-substituted BaFe2As2 single crystals is reported. In this particular material, Cu-substitution has a strong magnetic pair breaking effect. However, with increasing pressure, this sample shows an almost twofold increase of T c, from 3.2K to 6.9K, which is followed by an increase in J c. These observations are discussed considering the presence of magnetic pinning centers in the Fe-As plane, which, in principle, could suggest effective routes to increase Jc in the this class of materials. © 2014 AIP Publishing LLC.11517Paglione, J., Greene, R.L., (2010) Nature Phys., 6, p. 645. , 10.1038/nphys1759Johnston, D.C., (2010) Adv. Phys., 59, p. 803. , 10.1080/00018732.2010.513480Bean, C., (1962) Phys. Rev. Lett., 8, p. 250. , 10.1103/PhysRevLett.8.250Garitezi, T., Adriano, C., Rosa, P., Bittar, E., Bufaiçal, L., Almeida, R., Granado, E., Pagliuso, P., (2013) Braz. J. Phys., 43, p. 223. , 10.1007/s13538-013-0144-zRotter, M., Tegel, M., Johrendt, D., (2008) Phys. Rev. Lett., 101, p. 107006. , 10.1103/PhysRevLett.101.107006Ni, 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.82.024519Colonna, N., Profeta, G., Continenza, A., (2011) Phys. Rev. B, 83, p. 224526. , 10.1103/PhysRevB.83.224526Rosa, 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.86.165131Rosa, P.F.S., Adriano, C., Garitezi, T.M., Grant, T., Fisk, Z., Urbano, R.R., Fernandes, R.R., Pagliuso, P.G., Unconventional superconductivity in substituted BaFe2As 2 revealed by pair-breaking studies Nature Scientific Reports, , (submitted)Alireza, P.L., Ko, Y.T.C., Gillett, J., Petrone, C.M., Cole, J.M., Lonzarich, G.G., Sebastian, S.E., (2009) J. Phys.: Condens. Matter, 21, p. 012208. , 10.1088/0953-8984/21/1/012208Tanatar, M.A., Ni, N., Martin, C., Gordon, R.T., Kim, H., Kogan, V.G., Samolyuk, G.D., Prozorov, R., (2009) Phys. Rev. B, 79, p. 094507. , 10.1103/PhysRevB.79.09450
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Quantum Oscillations In Eufe2 As2 Single Crystals
Full text linkQuantum oscillation measurements provide relevant information about the Fermi surface (FS) properties of strongly correlated metals. Here, we report on the Shubnikov-de Haas effect via high-field resistivity measurements of EuFe2As2 (Eu122) and BaFe2As2 (Ba122) single crystals. Although both pnictide compounds are isovalent with similar effective masses and density of states, at the Fermi level, our results reveal subtle changes in their fermiology. Remarkably, although the spin-density-wave (SDW) ordering temperature is higher in the Eu-rich end, Eu122 displays a much more isotropic and three-dimensional-like FS when compared with Ba122, in agreement with band structure calculations. Our experimental results suggest an anisotropic contribution of the Fe 3d orbitals to the FS in Ba122. We speculate that this orbital differentiation may be responsible for the suppression of the SDW phase in the FeAs-based compounds.9019Kamihara, Y., Watanabe, T., Hirano, M., Hosono, H., (2008) J. Am. Chem. Soc., 130, p. 3296. , JACSAT 0002-7863Rotter, M., Tegel, M., Johrendt, D., Schellenberg, I., Hermes, W., Pöttgen, R., (2008) Phys. Rev. B, 78, p. 020503. , (R). PRBMDO 1098-0121Rotter, M., Tegel, M., Johrendt, D., (2008) Phys. Rev. Lett., 101, p. 107006. , PRLTAO 0031-9007Wang, C., Li, L., Chi, S., Zhu, Z., Ren, Z., Li, Y., Wang, Y., Xu, Z., (2008) Europhys. Lett., 83, p. 67006. , EULEEJ 0295-5075Ishida, K., Nakai, Y., Hosono, H., (2009) J. Phys. Soc. Japan, 78, p. 062001. , JUPSAU 0031-9015Johnston, D.C., (2010) Adv. Phys., 59, p. 803. , ADPHAH 0001-8732Paglione, J., Greene, R.L., (2010) Nat. Phys., 6, p. 645. , 1745-2473Canfield, P.C., Bud'Ko, S.L., (2010) Annu. Rev. Cond. Mat. Phys., 1, p. 27. , 1947-5454Wen, H.H., Li, S., (2011) Annu. Rev. Cond. Mat. Phys., 2, p. 121. , 1947-5454Stewart, G.R., (2011) Rev. Mod. Phys., 83, p. 1589. , RMPHAT 0034-6861Urbano, 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. , PRLTAO 0031-9007Zhou, B., Zhang, Y., Yang, L.-X., Xu, M., He, C., Chen, F., Zhao, J.-F., Feng, D.L., (2010) Phys. Rev. B, 81, p. 155124. , PRBMDO 1098-0121De Jong, S., Van Heumen, E., Thirupathaiah, S., Huisman, R., Massee, F., Goedkoop, J.B., Ovsyannikov, R., Golden, M.S., (2010) Europhys. Lett., 89, p. 27007. , EULEEJ 0295-5075Ding, H., Nakayama, K., Richard, P., Souma, S., Sato, T., Takahashi, T., Neupane, M., Wang, N.L., (2011) J. Phys. Condens. Matt., 23, p. 135701. , JCOMEL 0953-8984Hin, Z.P., Haule, K., Kotliar, G., (2011) Nat. Mater., 10, p. 932. , 1476-1122Thirupathaiah, S., (2011), Ph.D. thesis, Helmholtz-Zentrum Berlin, Albert-Einstein-StrasseSchoenberg, D., (1984) Magnetic Oscillations in Metals, , (Cambridge University Press, Cambridge)Sebastian, S.E., (2012) Magnetism and Superconductivity: From Cuprates to Iron-Pnictides, p. 4. , in (Pan Stanford, Singapore), Chap.Sebastian, S.E., Gillett, J., Harrison, N., Lau, P.H.C., Singh, D.J., Mielke, C.H., Lonzarich, G.G., (2008) J. Phys.: Cond. Matt., 20, p. 422203. , JCOMEL 0953-8984Analytis, J.G., McDonald, R.D., Chu, J.-H., Riggs, S.C., Bangura, A.F., Kucharczyk, C., Johannes, M., Fisher, I.R., (2009) Phys. Rev. B, 80, p. 064507. , PRBMDO 1098-0121Terashima, T., Kurita, N., Tomita, M., Kihou, K., Lee, C.-H., Tomioka, Y., Ito, T., Nakajima, M., (2011) Phys. Rev. Lett., 107, p. 176402. , S. Uji,. PRLTAO 0031-9007Harrison, N., McDonald, R.D., Mielke, C.H., Bauer, E.D., Ronning, F., Thompson, J.D., (2009) J. Phys. Condens. Matter, 21, p. 322202. , JCOMEL 0953-8984Kurita, N., Kimata, M., Kodama, K., Harada, A., Tomita, M., Suzuki, H.S., Matsumoto, T., Terashima, T., (2011) J. Phys.: Conf. Ser., 273, p. 012098. , 1742-6596Jeevan, H.S., Hossain, Z., Kasinathan, D., Rosner, H., Geibel, C., Gegenwart, P., (2008) Phys. Rev. B, 78, p. 052502. , PRBMDO 1098-0121Jiang, S., Luo, Y., Ren, Z., Zhu, Z., Wang, C., Xu, X., Tao, Q., Xu, Z., (2009) New J. Phys., 11, p. 025007. , NJOPFM 1367-2630Garitezi, T.M., Adriano, C., Rosa, P.F.S., Bittar, E.M., Bufaical, L., De Almeida, R.L., Granado, E., Pagliuso, P.G., (2013) Brazilian J. Phys., 43, p. 223. , BJPHE6 0103-9733Blaha, P., Schwarz, K., Madsen, G.K.H., Kvasnick, D., Luitz, J., (2001) WIEN2K, , (Karlheinz Schwarz, Techn. Universitat Wien, Vienna, Austria)Perdew, J.P., Wang, Y., (1992) Phys. Rev. B, 45, p. 13244. , PRBMDO 0163-1829Anisimov, V.I., Zaanen, J., Andersen, O.K., (1991) Phys. Rev. B, 44, p. 943. , PRBMDO 0163-1829Xiao, Y., Su, Y., Meven, M., Mittal, R., Kumar, C.M.N., Chatterji, T., Price, S., Brueckel Th., (2009) Phys. Rev. B, 80, p. 174424. , PRBMDO 1098-0121Huang, Q., Qiu, Y., Bao, W., Green, M.A., Lynn, J.W., Gasparovic, Y.C., Wu, T., Chen, X.H., (2008) Phys. Rev. Lett., 101, p. 257003. , PRLTAO 0031-9007Xiao, Y., (2010) Phys. Rev. B, 81, p. 220406. , (R). PRBMDO 1098-0121Graf, D., Stillwell, R., Murphy, T.P., Park, J.-H., Palm, E.C., Schlottmann, P., McDonald, R.D., Tozer, S.W., (2012) Phys. Rev. B, 85, p. 134503. , PRBMDO 1098-0121Rosa, P.F.S., Adriano, C., Iwamoto, W., Garitezi, T.M., Grant, T., Fisk, Z., Pagliuso, P.G., (2012) Phys. Rev. B, 86, p. 165131. , PRBMDO 1098-0121Rosa, P.F.S., Adriano, C., Garitezi, T.M., Grant, T., Fisk, Z., Urbano, R.R., Pagliuso, P.G., (2014) Sci. Rep., 4, p. 6543. , 2045-2322Granado, E., Mendonça-Ferreira, L., Garcia, F., De M. Azevedo, G., Fabbris, G., Bittar, E.M., Adriano, C., Pagliuso, P.G., (2011) Phys. Rev. B, 83, p. 184508. , PRBMDO 1098-0121Raffius, H., Morsen, E., Mosel, B.D., Muller, W., Warmuth, W., Jeitschko, W., Terbuchte, L., Vomhof, T.J., (1993) J. Phys. Chem. Solids, 54, p. 135. , JPCSAW 0022-369
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
