Control of the ferroelectric properties of DyMn2O5 by magnetic fields
Control of the ferroelectric properties of DyMn2O5 by magnetic fields
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DOI：
10.1103/physrevb.70.174405
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发表时间：
2004-11-01
影响因子：
3.7
通讯作者：
Tokura, Y
中科院分区：
文献类型：
--
作者：
Higashiyama, D;Miyasaka, S;Tokura, Y
由于通过外部磁场（电场）控制电（磁）极化的基础和技术重要性，磁性和介电特性之间的耦合重新引起了人们的兴趣。在这里，我们报告了外部磁场感应和/或改变磁性材料 DyMn2O5 中的铁电态的现象。对磁滞极化曲线、热释电流、比热、光学二次谐波产生和 X 射线超晶格峰的温度依赖性的测量揭示了 43 至 4 K 之间的连续相变，并伴随着三个铁电相。零场最低温度相（
Coupling between magnetic and dielectric properties has been attracting renewed interest because of the fundamental as well as technological importance of controlling the electric (magnetic) polarization by an external magnetic (electric) field. Here, we report the phenomenon that an external magnetic field induces and/or modifies ferroelectric states in a magnetic material, DyMn2O5. Measurements of the temperature dependence of hysteretic polarization curves, pyroelectric current, specific heat, optical second harmonic generation, and x-ray superlattice peaks have revealed successive phase transitions between 43 and 4 K, accompanying three ferroelectric phases. The zero-field lowest-temperature phase (