Abstract
Abstract We present the investigation of low-energy excitations in CDW compounds by means of ultra low-frequency dielectric spectroscopy. The method of thermally stimulated discharging current (TSDC) with effective frequencies in the range 10−4-10−2 Hz has been used in addition to the measurement of transient current recorded in seven decades of time. These methods show themselves as very sensitive probes of complex features of the dielectric freezing in CDW systems. The main peaks in the TSDC spectra appear at slightly lower temperatures than the peaks in low frequency susceptibility measurements. The isothermal depolarisation shows coexistence of two relational processes. Occurrences of the low-temperature glass transition in CDW system is discussed.
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