ECRYS - 93
J. Phys. IV France 03 (1993) C2-21-C2-26
NMR in spin-density wave phase of (TMTSF)2ClO4K. NOMURA1, N. KEITOKU1, T. SHIMIZU1, T. SAMBONGI1, M. TOKUMOTO2, N. KINOSHITA2 and H. ANZAI3
1 Department of Physics, Hokkaido University, Sapporo 060, Japan
2 Electrotechnical Laboratory, Tsukuba, Ibaraki 305, Japan
3 Department of Material Science, Himeji Institute of Technology, Kamigohri, Hyogo 678-12, Japan
The spin-density wave (SDW) phase of quenched (TMTSF)2ClO4 was investigated by both measurements of narrow band noise and 1H NMR relaxation rate. In the rapidly quenched phase, the sharp peak of narrow band voltage noise associated with the sliding motion of SDW is abruptly broadened in the narrow temperature range around 1.7 K much lower than the SDW transition temperature (5.7 K) and becomes undetectable at high temperature. This indicates that the spatial coherence of sliding motion is decreasing above this temperature. The divergent behavior in NMR relaxation rate is also observed at 1.7 K in the rapidly quenched phase. Thase results suggests that another phase transition occurs in the SDW phase. The temperature of this phase boundary decreases proportionally with the SDW transition temperature controlled by the anion quenching rate. The mechanism of this transition is closely related with that of the SDW transition.
© EDP Sciences 1993