Magnetic and dielectric properties of A2CoSi2O7 (A=Ca, Sr, Ba) crystals

被引:26
作者
Akaki, M. [1 ]
Tozawa, J. [1 ]
Akahoshi, D. [1 ]
Kuwahara, H. [1 ]
机构
[1] Sophia Univ, Dept Phys, Tokyo 1028554, Japan
来源
25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4: QUANTUM PHASE TRANSITIONS AND MAGNETISM | 2009年 / 150卷
关键词
D O I
10.1088/1742-6596/150/4/042001
中图分类号
O414.1 [热力学];
学科分类号
摘要
We have investigated the magnetic and dielectric properties of A(2)CoSi(2)O(7) (A=Ca, Sr, and Ba) crystals with a two-dimensional network of CoO(4) and SiO(4) tetrahedra connected with each other through the corners. In Ca(2)CoSi(2)O(7), a weak ferromagnetic transition occurs at 5.7 K, where the dielectric constant parallel to the c axis shows a concomitant anomaly. The large magnetocapacitance effect is observed below 5.7 K; Delta epsilon(H)/epsilon(0) equivalent to [epsilon(H)-e(0)]/epsilon(0) reaches 13 % at 5.1 K. These results indicate a strong coupling between the magnetism and dielectricity in Ca(2)CoSi(2)O(7). Sr(2)CoSi(2)O(7) shows a similar magnetoelectric behavior to that of Ca(2)CoSi(2)O(7). In contrast, in Ba(2)CoSi(2)O(7), which has the different arrangement of SiO(4) and CoO(4) tetrahedra from that of Ca(2)CoSi(2)O(7), the magnetocapacitance is hardly observed. The key for the magnetocapacitance effect of A(2)CoSi(2)O(7) lies in the quasi-two-dimensional crystal structure.
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页数:4
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