Asymmetric phase diagram of mixed $CuInP_2(S_xSe_{1-x})_6$ crystals

Details Asymmetric phase diagram of mixed $CuInP_2(S_xSe_{1-x})_6$ crystals Asymmetric phase diagram of mixed $CuInP_2(S_xSe_{1-x})_6$ crystals

2007-12-12

arxiv.org/abs/0712.1920v2

Nonlinear Sciences

Adaptation and Self-Organizing Systems

11 pages 14 figures

Scientific paper

10.1103/PhysRevB.78.064101

In this article mixed CuInP$_2$(S$_x$Se$_{1-x}$)$_6$ crystals were investigated by broadband dielectric spectroscopy (20 Hz - 3 GHz). From these results the complete phase diagram has been obtained. In the middle part of the phase diagram the dipolar glass phase has been observed. The phase diagram of investigated crystals is strongly asymmetric - the decreasing of ferroelectric phase transition temperatures in CuInP$_2$(S$_x$Se$_{1-x}$)$_6$ is much more flat with small admixture of sulphur then with small admixture of selenium. In boundary region between ferroelectric order and dipolar glass disorder with small amount of sulphur at low temperatures the nonergodic relaxor phase appears. The phase diagram was discussed in terms of random bonds and random fields.

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