DocumentCode :
1761489
Title :
Magnetocaloric Effect and Magnetoresistance Due to Itinerant Electron Metamagnetic Transition in 
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(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.
Keywords :
cobalt compounds; ferromagnetic materials; giant magnetoresistance; ground states; magnetic transitions; magnetocaloric effects; metamagnetism; paramagnetic materials; spin polarised transport; Co(S1-xSex)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
Link To Document :
