Abstract
We present a detailed magnetothermal study of Pr0.7Ca0.3MnO3, 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 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.
Original language | English (US) |
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Pages (from-to) | 417-431 |
Number of pages | 15 |
Journal | Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties |
Volume | 81 |
Issue number | 4 |
DOIs | |
State | Published - Apr 2001 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Physics and Astronomy(all)