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Phys. Rev. B 74, 214407 (2006) [5 pages]

Magnetic entropy change of itinerant electron metamagnetic system Co(S1−xSex)2

H. Wada and A. Mitsuda
Department of Physics, Kyushu University, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan

K. Tanaka
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
Received 11 July 2006; revised 14 October 2006; published 8 December 2006

The magnetic entropy change, DeltaSM, of Co(S1−xSex)2 has been studied for 0<=x<=0.11. Compounds with 0.03<=x<=0.11 undergo a first-order magnetic transition and exhibit itinerant electron metamagnetism (IEM) just above the Curie temperature. We observed that the peak value of DeltaSM shows a maximum at around x=0.07. The results are compared with the theoretically calculated results based on the spin fluctuation theory of IEM reported by Yamada and Goto. It is found that the experimental results are well described by the theoretical calculations. The origin of the peak of DeltaSM is discussed from the thermodynamical point of view.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.74.214407
DOI: 10.1103/PhysRevB.74.214407
PACS: 75.30.Sg; 75.30.Kz
  • 75.30.Sg
    Magnetocaloric effect, magnetic cooling (magnetically ordered materials)
  • 75.30.Kz
    Magnetic phase boundaries including magnetic transitions, metamagnetism, etc
  • YEAR: 2006
KEYWORDS: entropy, band model of magnetism, metamagnetism, cobalt compounds, magnetic transitions

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