Abstract
Conduction electron spin resonance study on the organic conductor (DMET) 2AuBr 2 was performed in the temperature range between 10 and 300 K. The linewidth is exceptionally large compared with the usual organic conductors and has an anomalous temperature dependence: with decreasing temperature, the linewidth increases gradually, forms a broad peak around 150 K, and then decreases rapidly. The peak value is as large as 1000 G. The temperature of the linewidth maximum corresponds well to that of resistivity maximum. On the other hand, the spin susceptibility is insensitive to temperature. The anomaly in the linewidth and the resistivity is inferred to be dynamical in origin.
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