A Phenomenological Theory of the Low Temperature Transition in K2Ba(NO2)4

Yoshihiro Ishibashi; Shinji Tanaka; Vladimir Dvo\v{r}ák

doi:10.1143/JPSJ.59.2995

Journal of the Physical Society of Japan

Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015

A Phenomenological Theory of the Low Temperature Transition in K₂Ba(NO₂)₄

Yoshihiro Ishibashi, Shinji Tanaka, Vladimir Dvo\v{r}ák

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Keywords: K₂Ba(NO₂)₄, phase transition, phenomenological theory

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1990 Volume 59 Issue 8 Pages 2995-2997

DOI https://doi.org/10.1143/JPSJ.59.2995

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Abstract

The low-temperature transition in K₂Ba(NO₂)₄ is analyzed using a Landau-type thermodynamic potential function, and it is found that the low-temperature phase must be monoclinic if the transition is induced by the instability of a mode at k₀=(1⁄2, 1⁄2, 1⁄2) of the Pbam phase.

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