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Effect of an External Electric Field on Phase Transitions of Order‐Disorder Crystals
Author(s) -
Merten L.,
Andrade P. Da R.,
Borstel G.
Publication year - 1975
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.2220700224
Subject(s) - condensed matter physics , electric field , field (mathematics) , dielectric , relaxation (psychology) , polariton , phonon , physics , phase (matter) , function (biology) , dielectric function , order (exchange) , quantum mechanics , mathematics , psychology , social psychology , evolutionary biology , pure mathematics , biology , finance , economics
Recently a model theory was given by the authors for the coupling of long optical phonons and polaritons with a Debye‐Mason relaxation in order‐disorder crystals. This theory is extended to the case of applying an external electric field to the crystal. It is shown that the effective field entering into the dielectric function can be determined by an iteration method. As the relation between the effective field and the external field is known, the (complex) frequencies of polaritons, phonons, and relaxations can be calculated as functions of the external field. Numerical evaluations shall be given elsewhere.