Anomalous pressure effect on the magnetic ordering in multiferroic BiMnO3

作者：Chou, C C; Taran, S; Her, J L; Sun, C P; Huang, C L; Sakurai, H; Belik, A A; Takayama Muromachi, E; Yang, H D^*

来源：PHYSICAL REVIEW B, 2008, 78(9): 092404.

DOI：10.1103/PhysRevB.78.092404

We report the magnetic-field-dependent dc magnetization and the pressure-dependent (p(max) similar to 16 kbar) ac susceptibilities chi(p)(T) on both powder and bulk multiferroic BiMnO3 samples, synthesized in different batches under high pressure. A clear ferromagnetic (FM) transition is observed at T-C similar to 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 (T-C) decrease simultaneously with increasing pressure. Interestingly, above a certain pressure (9-11 kbar), another peak appears at T-p similar to 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 (p(max) similar to 16 kbar). These features are considered to originate from the complex interplay of the magnetic and orbital structure of BiMnO3 being affected by pressure.

• 出版日期2008-9
• 单位中山大学