Nuclear spin relaxation in a liquid alloy with segregation tendency

In liquid In_0.83Te_0.17 which exhibits demixing at T_c=835 K, we have measured the nuclear spin relaxation rate R of the isomeric probe 117msb by a TDPAD technique. Within an interval of 50 K, an increase of R by about 30% is observed as T T_c. This phenomenon is interpreted as indicating a marked increase of concentration fluctuations over small regions in r-space.Guest of Sfb 161We are obliged to Gesellschaft für Kernforschung Karlsruhe for machine time and technical assistance. This work is supported by Deutsche Forschungsgemeinschaft through Sonderforschungsbereich 161.