Abstract
The temperature dependence of the spin-lattice relaxation time of 14N nuclear quadrupole resonance was determined to study the structural phase transition in K 2Hg(CN) 4. An increase of the relaxation rate which is attributable to the softening of a lattice mode was observed when the temperature approaches the transition point T c = 109 ± 1 K from the high-temperature side. However, no anomaly in the relaxation rate was observed below T c. A small but definite hysteresis was observed in the temperature dependence of the resonance frequency indicating that this phase transition is first order.
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