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Electron-Lattice Coupling in Manganites and Cuprates

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Abstract

The lattice effects of charge localization in manganites and cuprates arediscussed from the local structural point of view. Pulsed neutron atomicpair-density function (PDF) analysis indicates that in La1−x Sr x MnO3 the realstructure deviates from the average crystal structure, and the localJahn–Teller (JT) distortion of Mn3+O6 octahedra remains even in themetallic phase. This leads to a concept of the critical ionic size factorfor the formation of JT polarons. The colossal magnetoresistance (CMR)phenomena are observed in the crossover region from localized to delocalizedcharge states. This concept also explains the asymmetry of the phase diagramwhich is difficult to understand in the current band picture. Similarconsideration may help understand the lattice effects in superconductingcuprates.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania, 19104

    T. Egami

  2. Los Alamos National Laboratory, Los Alamos, New Mexico, 87545

    Despina Louca

Authors
  1. T. Egami
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  2. Despina Louca
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Egami, T., Louca, D. Electron-Lattice Coupling in Manganites and Cuprates. Journal of Superconductivity 12, 23–26 (1999). https://doi.org/10.1023/A:1007701015301

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  • DOI: https://doi.org/10.1023/A:1007701015301

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