Abstract
The magnetic properties of colossal magnetoresistance materials Cu(Cr 1− x Zr x ) 2S 4 have been studied by the ESR measurements. A single ESR absorption line which has a Lorentzian shape was observed at high-temperatures for x=0.50. The estimated g-value is 1.98 at 198 K, which well agrees with the g-value of the free ion of Cr 3+. With decreasing temperature, the absorption at high-temperatures splits into two absorptions below 100 K. As a possible mechanism, we suggest the coexistent magnetic states of ferromagnetism and paramagnetism for x=0.50. Any qualitative differences have not been observed in the ESR measurements for the sample with 0.45⩽ x⩽0.60. This fact indicates that the magnetic state does not change upon Zr substitution for x=0.50 in the range of at least ±0.05.
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