Magnetic Excitation and Electric Polarization in Strongly Coupled Spin Monomer and Dimer System Cu_3Mo_2O_9
Magnetic Excitation and Electric Polarization in Strongly Coupled Spin Monomer and Dimer System Cu_3Mo_2O_9
复制标题
强耦合自旋单体和二聚体体系Cu_3Mo_2O_9的磁激发和电极化
DOI：
10.1143/jpsj.81.024711
复制
发表时间：
2012
影响因子：
1.7
通讯作者：
M.Hase
中科院分区：
文献类型：
--
作者：
M.Matsumoto;H.Kuroe;T.Sekine;M.Hase
以Cu3Mo2O9为例，对强耦合自旋单体和二聚体体系的磁激发进行了理论研究，其中Cu3Mo2O9在零场下表现出反铁磁长程有序.引入二聚体的形状因子，我们提出了磁激发的公式。在外加磁场下，由于二聚体三重态的稳定化，发生了额外的场诱导量子相变。最近的实验研究表明，Cu3Mo2O9在磁有序态下表现出多铁性，并具有电极化。根据场致相变，我们发现电极化应该发生剧烈的变化。
Magnetic excitation in strongly coupled spin monomer and dimer system is studied theoretically focusing on Cu3Mo2O9as an typical example, where Cu3Mo2O9shows an antiferromagnetic long-range order at zero field. Introducing formfactors of dimers, we present the formulation for magnetic excitations. Under an external magnetic field, an additional field-induced quantum phase transition takes place due to the stabilization of a triplet state of the dimer. The recent experimental study revealed that Cu3Mo2O9shows an multiferroic behavior with an electric polarization in the magnetically ordered state. According to the field-induced transition, we find that the electric polarization should change drastically.