Sign reversal of the dielectric polarization of MnWo4 in very high magnetic fields
Sign reversal of the dielectric polarization of MnWo4 in very high magnetic fields
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DOI：
10.1088/1742-6596/150/4/042126
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发表时间：
2009-03
期刊：
影响因子：
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通讯作者：
H. Mitamura;H. Nakamura;T. Kimura;T. Sakakibara;K. Kindo
中科院分区：
文献类型：
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作者：
H. Mitamura;H. Nakamura;T. Kimura;T. Sakakibara;K. Kindo
已经检查了几何受挫自旋系统 MnWO4 的介电极化 P 的 B || x 和 E || b* 在高达 52 T 的脉冲磁场中。我们观察到两个新的相位 IV (38 ≤ B ≤ 48 T) 和 V (B ≥ 48 T)。此外，我们发现除了已知的 AF2 相之外，IV 相也表现出铁电性。有趣的是，发现 IV 相 P 的符号总是与 AF2 的符号相反，而与极化电场的方向 a 无关。结果表明，铁电畴在 AF2 相和 IV 相之间得以保留。
Dielectric polarization P of a geometrically frustrated spin system MnWO4 has been examined for B || x and E || b* in pulsed magnetic fields up to 52 T. We have observed two new phased IV (38 ≤ B ≤ 48 T) and V (B ≥ 48 T). Moreover, we found that the IV-phase also exhibits ferroelectricity, in addition to the AF2-phase already known. Interestingly, the sign of P of the IV-phase is found to be always opposite to that of AF2 irrespective of the direction aof a poling electric field. The results implied that the ferroelectric domain is preserved between the AF2 and IV phases.