Elastic Properties of NaCl: OH at Low Temperatures

Eizaburo Kanda; Terutaka Goto; Hiroshi Yamada; Shozo Suto; Satoshi Tanaka; Toshizo Fujitat

doi:10.1143/JPSJ.54.175

Elastic Properties of NaCl: OH at Low Temperatures

Eizaburo Kanda, Terutaka Goto, Hiroshi Yamada, Shozo Suto, Satoshi Tanaka, Toshizo Fujitat

IEHE - Institute for Excellence in Higher Education (organization affiliation only)

Tohoku University

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Low temperature behavior of elastic constants (C11&2014;C12)/2, C44 and C11 of NaCl crystals with OH impurity ions of various concentrations up to 650 ppm has been studied by means of an ultrasonic method. Pronounced softenings of the elastic constants below 50 K with minimum points around 0.8 K have been observed. The interaction between the elastic strain and the quadrupolar moments of the quantum tunneling states of an OH ion was found to be essential for the elastic anomalies. A variational method was employed to obtain the tunneling states of an OH ion in an off-center potential, and the quadrupolar moments of the states were calculated. The linear response theory for the quadrupolar moments has been adopted to explain the softening of the elastic constant.

Original language	English
Pages (from-to)	175-185
Number of pages	11
Journal	Journal of the Physical Society of Japan
Volume	54
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.54.175
Publication status	Published - 1985

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AU - Kanda, Eizaburo

AU - Goto, Terutaka

AU - Yamada, Hiroshi

AU - Suto, Shozo

AU - Tanaka, Satoshi

AU - Fujitat, Toshizo

PY - 1985

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AB - Low temperature behavior of elastic constants (C11&2014;C12)/2, C44 and C11 of NaCl crystals with OH impurity ions of various concentrations up to 650 ppm has been studied by means of an ultrasonic method. Pronounced softenings of the elastic constants below 50 K with minimum points around 0.8 K have been observed. The interaction between the elastic strain and the quadrupolar moments of the quantum tunneling states of an OH ion was found to be essential for the elastic anomalies. A variational method was employed to obtain the tunneling states of an OH ion in an off-center potential, and the quadrupolar moments of the states were calculated. The linear response theory for the quadrupolar moments has been adopted to explain the softening of the elastic constant.

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Elastic Properties of NaCl: OH at Low Temperatures

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