磁场增强EuTiO_{3}的结构不稳定性
Magnetic field enhanced structural instability in EuTiO_{3}
摘要：
EuTiO_{3}在T_S = 282 K时经历了从立方到四元的结构相变，没有伴随任何长程磁序。然而，它与区域边界声学模式软化驱动的氧半球旋转有关。在这里，我们表明，这种位移的二级结构相变可以转移到更高的温度通过施加外部磁场（增加4 K的mu_{0} H = 9 T）。这种观察到的场的依赖性是在协议的基础上耦合自旋-非谐-声子相互作用模型的理论预测。
英文摘要：
EuTiO_{3} undergoes a structural phase transition from cubic to tetragonal at T_S = 282 K which is not accompanied by any long range magnetic order. However, it is related to the oxygen ocathedra rotation driven by a zone boundary acoustic mode softening. Here we show that this displacive second order structural phase transition can be shifted to higher temperatures by the application of an external magnetic field (increased by 4 K for mu_{0}H = 9 T). This observed field dependence is in agreement with theoretical predictions based on a coupled spin-anharmonic-phonon interaction model.
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