Freezing of Soliton State Between T^c_c and T^h_c in K₂ZnC1₄

The hysteresis effect of commensurate-incommensurate transition has been investigated with the measurement of dielectric constant. The freezing of the soliton state in the hysteresis region was observed. The freezing may be kept for a very long time because of the pinning of impurities.