Magnetocaloric Effect and Magnetoresistance Due to Itinerant Electron Metamagnetic Transition in ${\\rm Co}({\\rm S}_{1-x}{\\rm Se}_{x})_{2}$

Author

Wada, Hiroyuki ; Kawasaki, Daichi ; Maekawa, Yasuyuki

Author_Institution

Dept. of Phys., Kyushu Univ., Fukuoka, Japan

Volume

50

Issue

6

fYear

2014

fDate

41791

Firstpage

1

Lastpage

6

Abstract

The Co(S_1-xSe_x)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(S_0.88Se_0.12)₂, which has a paramagnetic ground state. We observed giant positive MR associated with the itinerant electron metamagnetic transition for Co(S_1-xSe_x)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.

Keywords

cobalt compounds; ferromagnetic materials; giant magnetoresistance; ground states; magnetic transitions; magnetocaloric effects; metamagnetism; paramagnetic materials; spin polarised transport; Co(S_1-xSe_x)₂; band structure; cubic Pyrite structure; ferromagnetic state; giant positive magnetoresistance; high-spin polarization; itinerant electron metamagnetic transition; magnetocaloric effect; paramagnetic ground state; substantial magnetic entropy; Compounds; Magnetic fields; Magnetic hysteresis; Magnetization; Magnetoresistance; Temperature dependence; Temperature measurement; Giant magnetoresistance; Giant magnetoresistance (MR); itinerant electron metamagnetism; itinerant electron metamagnetism (IEM); magnetocaloric effect; magnetocaloric effect (MCE);

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2303818

Filename

6736118