Metastability in the commensurate phase of
Department of Physics and
Research Center for Dielectric and Advanced Matter Physics Pusan
National University - Pusan, 609-735, Korea
Accepted: 23 February 2001
A new dielectric anomaly is found at the temperature (260-290 K) in the commensurate (C) phase of , which separates the commensurate phase into two states. The C phase above is a metastable state, in which the relaxation of the polarization is expressed by the stretched exponential form, and the C phase below is a stable state in which the dielectric constant and polarization are independent of time. It is speculated that the dielectric anomaly found at the temperature is a stabilization process of discommensurations. This anomaly could be observed only in a measurement performed using a liquid-nitrogen cooler (LNC) without mechanical vibration of the measurement system.
PACS: 64.70.Rh – Commensurate-incommensurate transitions / 64.60.My – Metastable phases
© EDP Sciences, 2001