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Modified Phase Modulation‐Only Approximation of Incommensurate Phases in K 2 SeO 4 ‐Type Crystals
Author(s) -
Mashiyama H.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221180232
Subject(s) - condensed matter physics , logarithm , phase transition , soliton , modulation (music) , dielectric , landau theory , type (biology) , physics , phase (matter) , materials science , quantum mechanics , mathematics , nonlinear system , mathematical analysis , ecology , acoustics , biology
The incommensurate‐commensurate transition in K 2 SeO 4 ‐type crystals is studied on the base of a Landau free energy. The phase modulation‐only approximation is modified to take account of the effect of the amplitude modulation partially but in a consistent way. The soliton density decreases continuously with a logarithmic law near the lock‐in temperature. It is also shown that the specific heat and the dielectric susceptibility diverge at the transition point.