Order parameter fluctuation spectrum and central peak in partially deuterated H-bonded ferroelectrics |
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Authors: | FC Sa Barreto AST Pires R Blinc |
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Institution: | Dept. de Fisica, ICEX, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil |
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Abstract: | The order parameter fluctuation spectrum in an isotopically disordered KH2PO4 type crystal has been evaluated as a function of the deuterium content using Mori's continued fraction representation. In contrast to a pure system we have now two narrow central peaks and two overdamped soft modes. The results show that the static central peak observed by light scattering in paraelectric KH2PO4 cannot be produced by naturally abundant deuterium. |
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