ESR Study of Ferroelastic Phase Transition in KH<SUB>3</SUB>(SeO<SUB>3</SUB>)<SUB>2</SUB> doped with Cr<SUP>3+</SUP>

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  • Niimori Kazumi
    Department of Applied Physics, Faculty of Science, Fukuoka University
  • Nakagawa Yasutoshi
    Department of Applied Physics, Faculty of Science, Fukuoka University
  • Hukuda Kenzi
    Department of Applied Physics, Faculty of Science, Fukuoka University

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  • ESR Study of Ferroelastic Phase Transition in KH3(SeO3)2 Doped with Cr3+
  • ESR Study of Ferroelastic Phase Transit

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Abstract

ESR spectra of Cr3+ at K-site in KH3(SeO3)2 crystal have been studied. Below Tc, there are two kinds of inequivalent Cr3+ sites whose principal coordinate systems (X, Y and Z) of D-tensor are slightly rotated around Z-axis each other. The critical exponent value β was estimated to be 0.50±0.02 from the difference in principal value between the two inequivalent sites. The experimental results indicate that reorientation of SeO32− groups is accompanied by proton ordering and K ion displacement in the ac plane perpendicular to the O(2)–H(2)–O(2) bond direction below Tc. ESR spectra corresponding to single domain were observed by application of shear stress X4.

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