We report the magnetic-field-dependent dc magnetization and the pressure-dependent (pmax ∼16 kbar) ac susceptibilities χp (T) on both powder and bulk multiferroic BiMnO3 samples, synthesized in different batches under high pressure. A clear ferromagnetic (FM) transition is observed at TC ∼100 K, and increases with magnetic field. The magnetic hysteresis behavior is similar to that of a soft ferromagnet. Ac susceptibility data indicate that both the FM peak and its temperature (TC) decrease simultaneously with increasing pressure. Interestingly, above a certain pressure (9-11 kbar), another peak appears at Tp ∼93 K, which also decreases with increasing pressure, with both these peaks persisting over some intermediate pressure range (9-13 kbar). The FM peak disappears with further application of pressure; however, the second peak survives until present pressure limit (pmax ∼16 kbar). These features are considered to originate from the complex interplay of the magnetic and orbital structure of BiMnO3 being affected by pressure.
|期刊||Physical Review B - Condensed Matter and Materials Physics|
|出版狀態||Published - 2008 九月 11|
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