Artículos de revistas
Disorder Effects At Low Temperatures In La0.7-xy Xca0.3mno3 Manganites
Registro en:
Solid State Communications. , v. 127, n. 09/10/15, p. 683 - 687, 2003.
381098
10.1016/S0038-1098(03)00511-8
2-s2.0-0042014320
Autor
Gusmao M.A.
Ghivelder L.
Freitas R.S.
Ribeiro R.A.
De Lima O.F.
Damay F.
Cohen L.F.
Institución
Resumen
With the aim of probing the effect of magnetic disorder in the low-temperature excitations of manganites, specific heat measurements were performed in zero field, and in magnetic fields up to 9T in polycrystalline samples of La0.7-xYxCa0.3MnO3, with Y concentrations x=0, 0.10, and 0.15. Yttrium doping yielded the appearance of a cluster-glass state, giving rise to unusual low-temperature behavior of the specific heat. The main feature observed in the results is a strong enhancement of the specific heat linear term, which is interpreted as a direct consequence of magnetic disorder. The analysis was further corroborated by resistivity measurements in the same compounds. © 2003 Elsevier Ltd. All rights reserved. 127 09/10/15 683 687 Ramirez, A.P., Schiffer, P., Cheong, S.-W., Chen, C.H., Bao, W., Palstra, T.T.M., Gammel, P.L., Zegarski, B., (1996) Phys. Rev. Lett., 76, p. 3188 Ghivelder, L., Castillo, I.A., Alford, N.M., Tomka, G.J., Riedi, P.C., MacManus-Driscoll, J., Hossain, A.K.M.A., Cohen, L.F., (1998) J. Magn. Magn. Mater., 189, p. 274 Woodfield, B.F., Wilson, M.L., Byers, J.M., (1997) Phys. Rev. Lett., 78, p. 3201 Hamilton, J.J., Keatley, E.L., Ju, H.L., Raychaudhuri, A.K., Smolyaninova, V.N., Greene, R.L., (1996) Phys. Rev. B, 54, p. 14926 Ghivelder, L., Castillo, I.A., Gusmão, M.A., Alonso, J.A., Cohen, L.F., (1999) Phys. Rev. B, 60, p. 12184 Gordon, J.E., Fisher, R.A., Jia, Y.X., Phillips, N.E., Reklis, S.F., Wright, D.A., Zettl, A., (1999) Phys. Rev. B, 59, p. 127 Lees, M.R., Petrenko, O.A., Balakrishnan, G., Paul, D.M.K., (1999) Phys. Rev. B, 59, p. 1298 Hardy, V., Wahl, A., Martin, C., Simon, C., (2001) Phys. Rev. B, 63, p. 224403 Smolyaninova, V.N., Biswas, A., Zhang, X., Kim, K.H., Kim, B.-G., Cheong, S.-W., Greene, R.L., (2000) Phys. Rev. B, 62, p. 6093 Raychaudhuri, A.K., Guha, A., Das, I., Rawat, R., Rao, C.N.R., (2001) Phys. Rev. B, 64, p. 165111 Okuda, T., Kimura, T., Tokura, Y., (1999) Phys. Rev. B, 60, p. 3370 Fisher, R.A., Bouquet, F., Phillips, N.E., Franck, J.P., Zhang, G., Gordon, J.E., Marcenat, C., (2001) Phys. Rev. B, 64, p. 134425 Smolyaninova, V.N., Biswas, A., Fournier, P., Lofland, S., Zhang, X., Zhao, G.-M., Greene, R.L., (2002) Phys. Rev. B, 65, p. 104419 Lynn, J.W., Erwin, R.W., Borchers, J.A., Huang, Q., Santoro, A., Peng, J.-L., Li, Z.Y., (1996) Phys. Rev. Lett., 76, p. 4046 Perring, T.G., Aeppli, G., Hayden, S.M., Carter, S.A., Remeika, J.P., Cheong, S.-W., (1996) Phys. Rev. Lett., 767, p. 711 Okuda, T., Tomioka, Y., Asamitsu, A., Tokura, Y., (2000) Phys. Rev. B, 61, p. 8009 Freitas, R.S., Ghivelder, L., Damay, F., Dias, F., Cohen, L.F., (2001) Phys. Rev. B, 64, p. 144404 Maignan, A., Martin, C., Damay, F., Raveau, B., Hejtmanek, J., (1998) Phys. Rev. B, 58, p. 2758 Mukherjee, S., Ranganathan, R., Anilkumar, P.S., Joy, P.A., (1996) Phys. Rev. B, 54, p. 9267 Nam, D.N.H., Jonason, K., Nordblad, P., Khiem, N.V., Phuc, N.X., (1999) Phys. Rev. B, 59, p. 4189 Hardy, V., Maignan, A., Hébert, S., Martin, C., (2003) Phys. Rev. B, 67, p. 024401 Walker, L.R., Walstedt, R.E., (1977) Phys. Rev. Lett., 38, p. 514 Kumar, D., Sankar, J., Narayan, J., Singh, R.K., Majumdar, A.K., (2002) Phys. Rev. B, 65, p. 094407 Rozenberg, E., Auslender, M., Felner, I., Gorodetsky, G., (2000) J. Appl. Phys., 88, p. 2578