Ho（1-x）YxMnO3中的面内和面外相关
In-plane and out-of-plane correlations in Ho(1-x)YxMnO3
摘要：
在六方晶系HoMnO_3中，在P6'3cm'和P6'3cm'磁相之间的自旋重取向温度下，已经观察到了强的磁-铁电耦合。相比之下，YMnO_3只有一个单一的磁相（P_6 '3cm'），没有强磁-铁电耦合的迹象。为了研究P6'3cm'到P6'3c'm的自旋重取向转变，生长了不同成分的Ho（1-x）YxMnO_3单晶。中子散射测量揭示了类YMnO_3相（P_（6 '3 c'm））的准弹性散射集中在类HoMnO_3相（P_（6' 3 cm '））的布拉格峰上，反之亦然。这种散射可能是由于短暂的波动到“错误的”磁相在域边界。这些结果表明，即使在纯YMnO_3中，P6'3cm'和P6'3c'm相之间也存在着强的相竞争，这种竞争可能在HoMnO_3中观察到的磁-铁电耦合中起着重要的作用。
英文摘要：
Strong magnetic-ferroelectric coupling in hexagonal HoMnO3 has been observed previously at spin reorientation temperature between P6'3cm' and the P6'3cm' magnetic phases. In contrast, YMnO3 has only a single magnetic phase (P6'3cm') and no sign of strong magnetic-ferroelectric coupling. In order to investigate the P6'3cm' to P6'3c'm spin reorientation transition, single crystals of Ho(1-x)YxMnO3 at varying compositions were grown. Neutron scattering measurements reveal quasielastic scattering in the YMnO3-like phase (P6'3c'm) centered on the Bragg peak corresponding to HoMnO3-like phase (P6'3cm') and vice versa. This scattering may be due to short-lived fluctuations into the "wrong" magnetic phase at domain boundaries. These results suggest that there is strong phase competition between the P6'3cm' and P6'3c'm phases even in pure YMnO3, and this competition may play an important role in the magnetic-ferroelectric coupling observed in HoMnO3.
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