Abstract
Recent computational and mean-field studies of models for manganese oxides have revealed a rich phase diagram, not anticipated in early calculations in this context. In particular, the transition between the antiferromagnetic insulator of the hole-undoped limit and the ferromagnetic metal at finite hole-density was found to occur through a mixed-phase process, with coexisting nanometer size clusters. More recently, the influence of disorder on the first-order transitions present in non-disordered manganite models has been shown to lead to giant cluster coexistence, as reported in several experiments. The size of the clusters can be very large since the two competing phases have the same electronic density. The results are illustrated using the random field Ising model. A plethora of experimental data for manganites and other materials are consistent with the phase segregation scenario. Overall it is concluded that inhomogeneities are the key ingredient regulating the physics of manganites. The ideas are general and should apply not only to manganites but to other compounds as well.
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References
S. Jin et al., Science 264, 413 (1994). Y. Tokura et al., J. Appl. Phys. 79, 5288 (1996); A. P. Ramirez, J. Phys.: Condens. Matter 9, 8171 (1997).
S-W. Cheong and H. Y. Hwang, in Colossal Magnetoresistance Oxides, ed. Y. Tokura, Gordon&Breach, Monographs in Cond. Matt. Science.
C. Zener, Phys. Rev. 82, 403 (1951).
J. Riera, K. Hallberg, and E. Dagotto, Phys. Rev. Lett. 79, 713 (1997).
S. Yunoki, J. Hu, A. Malvezzi, A. Moreo, N. Furukawa, and E. Dagotto, Phys. Rev. Lett. 80, 845 (1998).
S. Yunoki, A. Moreo, and E. Dagotto, Phys. Rev. Lett. 81, 5612 (1998).
A. Moreo, S. Yunoki and E. Dagotto, Science 283, 2034 (1999).
T. Hotta, S. Yunoki, M. Mayr, and E. Dagotto, Phys. Rev. B60, R15009 (1999).
S. Yunoki, T. Hotta, and E. Dagotto, cond-mat/9909254. Accepted in PRL.
T. Hotta, Y. Takada, H. Koizumi, and E. Dagotto, Phys. Rev. Lett. 84, 2477 (2000).
T. Hotta, A. Malvezzi, and E. Dagotto, submitted to Phys. Rev. B. condmat/0003056.
A. L. Malvezzi, S. Yunoki, and E. Dagotto, Phys. Rev. B 59, 7033 (1999).
M. R. Ibarra and J. M. De Teresa, contribution to Colossal Magnetoresistance, Charge Ordering and Related Properties of Manganese Oxides, edited by C. N. R. Rao and B. Raveau, World Scientific, 1998c.
M. Uehara, S. Mori, C. H. Chen, and S.-W. Cheong, Nature 399, 560 (1999).
M. Fäth, S. Freisem, A. A. Menovsky, Y. Tomioka, J. Aarts, and J. A. Mydosh, Science 285, 1540 (1999).
J. J. Neumeier and J. L. Cohn, preprint.
A. Moreo, M. Mayr, A. Feiguin, S. Yunoki and E. Dagotto, 1999 preprint, cond-mat/9911448, to appear in Phys. Rev. Letters.
S. Yunoki and A. Moreo, Phys. Rev. B58, 6403 (1998).
See Spin Glasses and Random Fields, ed. A. P. Young, World Scientific.
Y. Imry and S. K. Ma, Phys. Rev. Lett. 35, 1399 (1975).
J. Verges, preprint, cond-mat/9905235.
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Dagotto, E., Feiguin, A., Moreo, A. (2001). Theory of Manganites: the Key Role of Phase Segregation. In: Bonča, J., Prelovšek, P., Ramšak, A., Sarkar, S. (eds) Open Problems in Strongly Correlated Electron Systems. NATO Science Series, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0771-9_22
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DOI: https://doi.org/10.1007/978-94-010-0771-9_22
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