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Transition from Curie-Weiss to enhanced Pauli paramagnetism in R NiO 3 ( R = L <mml:mi mathvariant="…

2003; American Physical Society; Volume: 67; Issue: 2 Linguagem: Inglês

10.1103/physrevb.67.020404

1095-3795

Jianshi Zhou, John B. Goodenough, B. Dąbrowski,

Thermal Expansion and Ionic Conductivity

High-oxygen-pressure annealing, cold pressing, and measurement of properties under pressure have been used to reveal and to follow in the single-valent perovskites $R{\mathrm{NiO}}_{3}$ $(R=\mathrm{lanthanide})$ a crossover from localized to itinerant electronic behavior. Cold pressing proved critical for obtaining nearly intrinsic transport properties such as electronic and thermal conductivity in polycrystalline samples not available as single crystals. Suppression of the thermal conductivity in the crossover compositions ${\mathrm{NdNiO}}_{3}$ and ${\mathrm{PrNiO}}_{3}$ suggests cooperative bond-length fluctuations in this region.