High Magnetic Field Dependence of Magnetodielectric Properties in Sr2CoSi2O7 Crystal
High Magnetic Field Dependence of Magnetodielectric Properties in Sr2CoSi2O7 Crystal
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DOI：
10.1007/s10909-012-0796-z
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发表时间：
2013-03
影响因子：
2
通讯作者：
M. Akaki;T. Tadokoro;T. Kihara;M. Tokunaga;H. Kuwahara
中科院分区：
文献类型：
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作者：
M. Akaki;T. Tadokoro;T. Kihara;M. Tokunaga;H. Kuwahara
研究了外加磁场控制轨道杂化的高锰矿Sr2CoSi2O7单晶的磁性和介电性质。Sr2CoSi2O7显示了磁场诱导的不对称轨道杂化产生的电极化。即使在比磁转变温度高得多的温度下，也能观察到这种感应电极化。顺磁相的极化数据与感应磁化强度的平方成比例。通过对晶体对称性的讨论，高锰酸盐材料的极化态空间群可能为Cmm2。
We have investigated magnetic and dielectric properties of åkermanite Sr2CoSi2O7single crystal in which the orbital hybridization is controllable by external magnetic fields. Sr2CoSi2O7shows the electric polarization that is originated from asymmetric orbital hybridization induced by magnetic field. This induced electric polarization was observed even at temperatures considerably higher than the magnetic transition temperature. The polarization data obtained for the paramagnetic phase are scaled with the square of the induced magnetization. By the discussion of the crystal symmetry, the space group of a polar state of åkermanite materials is probablyCmm2.