Low Temperature Magnetothermodynamics of Pr{0.7}Ca{0.3}MnO{3}

Details Low Temperature Magnetothermodynamics of Pr{0.7}Ca{0.3}MnO{3} Low Temperature Magnetothermodynamics of Pr{0.7}Ca{0.3}MnO{3}

2001-01-16

arxiv.org/abs/cond-mat/0101223v1

Physics

Condensed Matter

21 pages, 11 figures, To be published in Phil. Mag. B

Scientific paper

10.1080/13642810110033818

We present a detailed magnetothermal study of Pr$_{0.7}$Ca$_{0.3}$MnO$_{3}$, a perovskite manganite in which an insulator-metal transition can be driven by magnetic field, but also by pressure, visible light, x-rays, or high currents. We find that the field-induced transition is associated with a large release of energy which accounts for its strong irreversibility. In the ferromagnetic metallic state, specific heat and magnetization measurements indicate a much smaller spin wave stiffness than that seen in any other ferromagnetic manganite, which we explain in terms of ferromagnetism among the Pr moments. The Pr ferromagnetism also appears to influence the low temperature thermodynamic phase diagram of this material and the uniquely sensitive metastability of the insulating state.

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