New magnetic semiconductors CuCr 1. 5Sb 0.5 S 4 with Co
Dilaram A. SaifullaevaSamarkand State Univ. (Uzbekistan)Shahlo F. SolievaSamarkand State Univ. (Uzbekistan)A. I. MuminovSamarkand State Univ. (Uzbekistan)
Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEjournal2003en
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Аннотация
We studied magnetic and electric properties new magenetic semicondcutors CuCr<sub>1.</sub>5Sb<sub>0.5</sub>S<sub>4</sub> with Co. All compounds are characteristic for antiferromagnetics. A giant negative magnetoresistance has been found in the new magnetic semiconductors xCoCr<sub>2</sub>S<sub>4</sub> - (1-x)CuCr<sub>1.5</sub>Sb<sub>0.5</sub>>S<sub>4</sub>, (x=0.25;0.5). Magnetoresistance is practically absent in CuCr<sub>1.5</sub>Sb<sub>0.5</sub>S<sub>4</sub> and does not exceed 2% in CoCr<sub>2</sub>S<sub>4</sub>. The giant magnetoresistance and the postivie value of e are evidence for the existence of afmons in compounds with Ni.
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