Thermal Conductivity of Manganite Perovskites: Colossal Magnetoresistance as a Lattice-Dynamics Transition
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)
- DuPont Central Research and Development, Experimental Station, Wilmington, Delaware 19880-0328 (United States)
We present the thermal conductivity ({kappa}) of several manganite perovskite compounds at temperatures 10{endash}350K and fields up to 6T. In the metallic phase, {kappa} behaves as expected for a crystalline solid. In the high-temperature insulating phase, however, d{kappa}/dT{gt}0, the behavior of an amorphous solid. Unlike amorphous solids, d{kappa}/dT{gt}0 here is related not to quenched structural disorder but rather to unusually large dynamic lattice distortions accompanying charge transport. Thus, {open_quotes}colossal magnetoresistance{close_quotes} in the manganite perovskites is characterized as a transition between regimes of different lattice dynamics. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 503733
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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