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arXiv 1003.2079cond-mat.str-el
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多铁性材料BiMnO3中的多重磁跃迁

Multiple magnetic transitions in multiferroic BiMnO3

C. C. Chou, C. L. Huang, S. Mukherjee, Q. Y. Chen, H. Sakurai, A. A. Belik, E. Takayama-Muromachi, H. D. Yang

摘要:

本文用直流磁化强度[Mg(T)]、磁滞回线[Ueff(H)]和交流磁化率[X 'g(T)]研究了多铁性BiMnO_3在静水压力下的磁相变化。在8.7和9.4 kbar下,确定了三个磁性转变,表现为Mg(T)]曲线上的扭结I、II和III。随着压力的增加,扭折I和扭折II的转变温度TkI和TkII有降低的趋势,而扭折III的转变温度TkIII则表现出更为复杂的变化。在增加磁场的情况下,TkI和TkII增加;然而,TkIII减少。结合[Mg(T)]曲线与Ueff(H)和X 'g(T),这三种扭结的更详细的性质将显示如下。扭结I是一种长程软铁磁转变,在环境压力下发生在TkI 100 K,但在11.9 kbar时完全被抑制。扭结II出现在8.7千巴与TkII 93 K,这也是长程软铁磁,但在性质上倾斜。扭结III,一个倾斜的反铁磁过渡,出现在TkIII 72.5 K随着扭结II也在8.7 kbar。在环境压力,9.4和11.9千巴的相图显示不同的磁功能的BiMnO 3。这些发现被认为是由于晶体结构的变化受到外部压力的影响。这些结果还表明,

英文摘要:

The magnetic phase variations under hydrostatic pressure on multiferroic BiMnO3 have been examined by the dc magnetization [Mg(T)], magnetic hysteresis [Ueff(H)], and ac susceptibility [X'g(T)]. Three magnetic transitions, manifested as kinks I, II, and III on the Mg(T)], curves, were identified at 8.7 and 9.4 kbar. With increasing pressure, transition temperatures of kink I and kink II TkI and TkII tend to decrease, but the temperature of kink III TkIII showed more complex variation. Under increasing magnetic field, TkI and TkII increase; however, TkIII decreases. Combining [Mg(T)] curves with Ueff(H) and X'g(T), more detailed properties of these three kinks would be shown as follows. Kink I is a long-range soft ferromagnetic transition which occurs at TkI 100 K under ambient pressure but is suppressed completely at 11.9 kbar. Kink II emerges at 8.7 kbar along with TkII 93 K which is also long-range soft ferromagnetic but canted in nature. Kink III, a canted antiferromagnetic transition, appears at TkIII 72.5 K along with kink II also at 8.7 kbar. The proposed phase diagrams at ambient pressure, 9.4 and 11.9 kbar show the different magnetic features of BiMnO3. These findings are believed to result from the variations in crystal structure influenced by the external pressure. These results also indicate the common complicated

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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