Magnetocaloric and structural properties of SmMn2Ge2

被引:15
作者
Koyama, K [1 ]
Miura, S
Okada, H
Shigeoka, T
Fujieda, S
Fujita, A
Fukamichi, K
Watanabe, K
机构
[1] Tohoku Univ, HFLSM, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[2] Yamaguchi Univ, Fac Sci, Yamaguchi 7538512, Japan
[3] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808571, Japan
关键词
magnetic entropy; magnetic phase transition; powder X-ray diffraction;
D O I
10.1016/j.jallcom.2005.04.181
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We have performed detailed magnetization, specific heat and powder X-ray diffraction measurements under magnetic fields, for obtaining information on the magnetic and the structural properties of re-entrant ferromagnet SmMn2Ge2 with the ThCr2Si2-type tetragonal structure. The lattice parameter a decreases by about 0.1%, while the parameter c increases slightly by about 0.02% in the antiferromagnetic (AFM) state, compared with the ferromagnetic (FM) and re-entrant ferromagnetic (RFM) states. In the AFM state, the structural distortion recovers by applying a magnetic field, accompanied with the metamagnetic transition from the AFM to the forced FM states. The results of a magnetocaloric effect indicate that the magnetic entropy change at these phase transitions is mainly due to the change of the Sm magnetic state. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:118 / 121
页数:4
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