Abstract
We have studied the 77 Se NMR spectrum and spin-lattice relaxation rate (SLRR) in the quasi-one-dimensional conductor (TaSe 4 ) 2 I in the temperature range of 150 to 320 K, i.e., both above and below the temperature of the charge-density wave transition, T c = 263 K. Both the Knight shift and the SLRR vary strongly with temperature in the entire range investigated with no sharp feature at T c . In particular, no critical divergence or Hebel-Slichter peak is observed. The SLRR is strongly non-Korringa, i.e., not proportional to the square of the Knight shift times temperature. All these findings are interpreted in terms of a fluctuating gap model.
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