Local lattice distortions and thermal transport in perovskite manganites

J. Cohn, J. Neumeier

Research output: Contribution to journalArticle

134 Scopus citations

Abstract

Measurements of thermal conductivity versus temperature and magnetic field are reported for perovskite manganites that exhibit ferromagnetic (FM), charge-ordering (CO), antiferromagnetic, and/or structural phase transitions. The data reveal a dominant lattice contribution to the heat conductivity with (Formula presented) W/mK near room temperature. The rather low values, implying a phonon mean free path on the order of a lattice spacing, are shown to correlate with static local distortions of the (Formula presented) octahedra. Modifications of the local structure are responsible for abrupt anomalies in the zero-field κ at the FM, CO, and structural transitions, and for colossal magnetothermal resistance near the FM transition.

Original languageEnglish (US)
Pages (from-to)R8495-R8498
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number14
DOIs
StatePublished - Jan 1 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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