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Non-ergodic instability and the quadrupolar glass state in K(CN) x Br1−x and (NaCN) x (KCN)1−x

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Zeitschrift für Physik B Condensed Matter

Abstract

Random strain fields, due to substitutional disorder, couple to translational and orientational dynamic modes in plastic crystals. One distinguishes the cases of weak and strong random fields. In weak fields, the crystal comes close to a structural phase transition. Then elastic restoring forces are weak while internal friction dominates. The resulting non ergodic instability marks the onset of a structural glass state. The evolution of the glass state is discussed within a selfconsistent theory. The results of an extensive numerical study are compared with experiment. In presence of strong random fields no instability occurs, and orientational freezing is a continuous process.

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Authors and Affiliations

  1. Department of Physics, University of Antwerp, UIA, Wilrijk, Belgium

    C. Bostoen & K. H. Michel

  2. Department Natuurkunde, Universitaire Instelling Antwerpen, Universiteitsplein 1, B-2610, Antwerpen (Wilrijk), Belgium

    C. Bostoen & K. H. Michel

Authors
  1. C. Bostoen
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  2. K. H. Michel
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Bostoen, C., Michel, K.H. Non-ergodic instability and the quadrupolar glass state in K(CN) x Br1−x and (NaCN) x (KCN)1−x . Z. Physik B - Condensed Matter 71, 369–376 (1988). https://doi.org/10.1007/BF01312496

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  • DOI: https://doi.org/10.1007/BF01312496

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