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An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites

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Local-Moment Ferromagnets

Part of the book series: Lecture Notes in Physics ((LNP,volume 678))

Abstract

We theoretically explore the mechanism of the colossal magnetoresistance in manganese oxides by explicitly taking into account the phase competition between the double-exchange ferromagnetism and the charge-ordered insulator. We find that quenched disorder causes a drastic change of the multicritical phase diagram by destroying the charge-ordered state selectively. As a result, there appears a nontrivial phenomenon of the disorder-induced insulator-to-metal transition in the multicritical regime. On the contrary, the disorder induces a highly-insulating state above the transition temperature where charge-ordering fluctuations are much enhanced. The contrasting effects provide an understanding of the mechanism of the colossal magnetoresistance. The obtained scenario is discussed in comparison with other theoretical proposals such as the polaron theory, the Anderson localization, the multicritical-fluctuation scenario, and the percolation scenario.

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Authors and Affiliations

  1. RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, 351-0198, Saitama, Japan

    Yukitoshi Motome

  2. Department of Physics, Aoyama Gakuin University, 5-10-1 Fuchinobe, 229-8558, Sagamihara, Kanagawa, Japan

    Nobuo Furukawa

  3. CREST, Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, 113-8656, Bunkyo-ku, Tokyo, Japan

    Naoto Nagaosa

  4. Correlated Electron Research Center, AIST, Tsukuba Central 4, 1-1-1 Higashi, 305-8562, Tsukuba, Ibarakixs, Japan

    Naoto Nagaosa

  5. Tokura Spin SuperStructure Project, ERATO, Tokura Spin SuperStructure Project, ERATO, Tsukuba Central 4, 1-1-1 Higashi, 305-8562, Tsukuba, Ibaraki, Japan

    Naoto Nagaosa

Authors
  1. Yukitoshi Motome
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  2. Nobuo Furukawa
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  3. Naoto Nagaosa
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Markus Donath Wolfgang Nolting

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Motome, Y., Furukawa, N., Nagaosa, N. An Origin of CMR: Competing Phases and Disorder-Induced Insulator-to-Metal Transition in Manganites. In: Donath, M., Nolting, W. (eds) Local-Moment Ferromagnets. Lecture Notes in Physics, vol 678. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11417255_5

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  • DOI: https://doi.org/10.1007/11417255_5

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-27286-1

  • Online ISBN: 978-3-540-31516-2

  • eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)

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