TY - JOUR
T1 - Magnetocaloric and structural properties of SmMn2Ge2
AU - Koyama, K.
AU - Miura, S.
AU - Okada, H.
AU - Shigeoka, T.
AU - Fujieda, S.
AU - Fujita, A.
AU - Fukamichi, K.
AU - Watanabe, K.
N1 - Funding Information:
The X-ray diffraction measurement in magnetic fields and the magnetization measurement were carried out at the High-Field Laboratory for Superconducting Materials, Institute for Materials Research and the Center for Low temperature Science, Tohoku University, respectively. This work was partly supported by Grants-in-Aid for Scientific Research from Ministry of Education, Science and Technology.
PY - 2006/2/9
Y1 - 2006/2/9
N2 - 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 SmMn 2Ge2 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.
AB - 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 SmMn 2Ge2 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.
KW - Magnetic entropy
KW - Magnetic phase transition
KW - Powder X-ray diffraction
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U2 - 10.1016/j.jallcom.2005.04.181
DO - 10.1016/j.jallcom.2005.04.181
M3 - Conference article
AN - SCOPUS:31144443581
VL - 408-412
SP - 118
EP - 121
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
T2 - Proceedings of the Rare Earths'04 in Nara, Japan
Y2 - 7 November 2004 through 12 November 2004
ER -