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 language | English (US) |
|---|---|
| Pages (from-to) | R8495-R8498 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 56 |
| Issue number | 14 |
| DOIs | |
| State | Published - Jan 1 1997 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Cohn, J., & Neumeier, J. (1997). Local lattice distortions and thermal transport in perovskite manganites. Physical Review B - Condensed Matter and Materials Physics, 56(14), R8495-R8498. https://doi.org/10.1103/PhysRevB.56.R8495