Critical slowing down of low-frequency dielectric relaxation in incommensurate [N(CH3)4]2ZnCl4

Le Van Hong, Gen Li, N. Tao, H. Z. Cummins

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Abstract

The complex dielectric constant of tetramethylammonium tetrachlorozincate (TMA-ZnCl4) in the incommensurate phase has been measured in the frequency range from 5 kHz to 13 MHz. Two relaxation processes were observed, one fast and one slow, which is common in A2BX4 crystals. In contrast to earlier investigations of TMA-ZnCl4, however, we find that both the slow relaxation process, which dominates (0) near the lock-in transition, and the fast process exhibit critical slowing down. This may indicate the coexistence of incommensurate and commensurate domains, or be related to a recent suggestion of Holakovsky, Dvorak, Fousek, and Kroupa concerning the pinning of solitons.

Original languageEnglish (US)
Pages (from-to)6050-6056
Number of pages7
JournalPhysical Review B
Volume41
Issue number9
DOIs
StatePublished - Jan 1 1990

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ASJC Scopus subject areas

  • Condensed Matter Physics

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