Magnetocaloric and structural properties of SmMn2Ge2

K. Koyama; S. Miura; H. Okada; T. Shigeoka; S. Fujieda; A. Fujita; K. Fukamichi; K. Watanabe

doi:10.1016/j.jallcom.2005.04.181

Magnetocaloric and structural properties of SmMn₂Ge₂

K. Koyama, S. Miura, H. Okada, T. Shigeoka, S. Fujieda, A. Fujita, K. Fukamichi, K. Watanabe

Research output: Contribution to journal › Conference article › peer-review

11 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	118-121
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	408-412
DOIs	https://doi.org/10.1016/j.jallcom.2005.04.181
Publication status	Published - 2006 Feb 9
Event	Proceedings of the Rare Earths'04 in Nara, Japan - Duration: 2004 Nov 7 → 2004 Nov 12

Keywords

Magnetic entropy
Magnetic phase transition
Powder X-ray diffraction

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Magnetocaloric and structural properties of SmMn2Ge2",

abstract = "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.",

keywords = "Magnetic entropy, Magnetic phase transition, Powder X-ray diffraction",

author = "K. Koyama and S. Miura and H. Okada and T. Shigeoka and S. Fujieda and A. Fujita and K. Fukamichi and K. Watanabe",

year = "2006",

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doi = "10.1016/j.jallcom.2005.04.181",

language = "English",

volume = "408-412",

pages = "118--121",

journal = "Journal of Alloys and Compounds",

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note = "Proceedings of the Rare Earths'04 in Nara, Japan ; Conference date: 07-11-2004 Through 12-11-2004",

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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.

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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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

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