Magnetocaloric Effect and Magnetoresistance Due to Itinerant Electron Metamagnetic Transition in Co(S1-xSex)(2)

作者：Wada Hirofumi^*; Kawasaki Daichi; Maekawa Yoshiro

来源：IEEE Transactions on Magnetics, 2014, 50(6): 2501806.

DOI：10.1109/TMAG.2014.2303818

• Giant magnetoresistance (MR)
• itinerant electron metamagnetism (IEM)
• magnetocaloric effect (MCE)

The Co(S1-xSex)(2) compounds with the cubic Pyrite structure show itinerant electron metamagnetism for 0.12 <= x. We studied the magnetocaloric effect and magnetoresistance (MR) of this system. It was found that a substantial magnetic entropy change was obtained for Co(S0.88Se0.12)(2), which has a paramagnetic ground state. We observed giant positive MR associated with the itinerant electron metamagnetic transition for Co(S1-xSex)(2). The magnitude of the MR jump is independent of temperature and concentration for 0.13 <= x <= 0.15. These results are discussed in terms of a simple band structure of CoS2, in which high-spin polarization is realized in a ferromagnetic state.

• 出版日期2014-6