New magnetic semiconductor sulfospinels with cobalt
Аннотация
We studied magnetic and electric properties new magnetic semiconductor CuCr1.5Sb0.5S4 and compounds with Co. All compounds are characteristic for antiferromagnetics. A giant negative magnetoresictance (for the compound with x=0.25 -16% in a magnetic field of 27 kOe, with x=0.5 -24% in a field of 30 kOe ) has been fond 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 in 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 positive value of θ are evidence for the existence of afmons in compound with Co.
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