Critical Anomaly in Thermopower near the Spin-Density-Wave Transition in Quasi-One-Dimensional Conductors, (DMET)2AuI2and (DMET)2Au(CN)2

Abstract

The thermopowers of (DMET) 2 AuI 2 and (DMET) 2 Au(CN) 2 were measured between liquid helium and room temperatures. In addition to the metallic thermopower above the SDW transition temperature (16 and 24 K for (DMET) 2 AuI 2 and (DMET) 2 Au(CN) 2 , respectively), a large excess contribution probably due to the SDW fluctuation was detected below about 70 K.