Geometrical Isotope Effect on the Hydrogen-Ordering Transition
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概要
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Hydrogen-ordering in KH.PO. (KDP)-type ferroelectric crystals is elucidated bymaking use of a double minima potential for ltydrc>gen. The two lowest eigenvalucsof this potential are obtained in an explicit form to corx-elate with the tunnellingenergy and the H-site separation c>. The order paratneter<,X'>and the transition fernperature T. are derived in the mean field theory, and the geometrical isotope effect isdiscussed. The T. values are compared with tltose obtained by means of the recentneutron diffraction experiments performed by Nelmes et at. The relationship betweenT. and l obtained is different from the linear relation proposed by Ichikawa.[KH.P0. (KDP), ferroelectric crystal, hydrogen bond, isotope effect, phase Iran- ll sition, tunnelling energy, mteutron diffractionl
- 社団法人日本物理学会の論文
- 1992-01-15
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