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Published January 1, 1984 | Published
Journal Article Open

Short-range ordering and freezing in a randomly mixed ferroelectric-antiferroelectric crystal

Abstract

X-ray measurements on single-crystals of Rb_(1−x)(NH_4)_xH_2PO_4 trace the development of a glasslike state. The absence of macroscopic crystal-symmetry change during freezing is confirmed, while diffuse scattering reveals the growth of very-short-range order. The latter coincides with a compressibility anomaly seen in Brillouin scattering and with dielectric effects suggesting freezing. The system is in many ways analogous to spin-glasses.

Additional Information

© 1984 The American Physical Society. Received 30 September 1983. We would like to thank S. von Molnar for his preliminary specific-heat measurement, and G. Grinstein and E. Pytte for helpful discussions, as well as P. Bayer for his careful growth and cutting of the fragile single-crystal platelets. One of us (S.E.N.) was supported by a Natural Science and Engineering Research Council of Canada fellowship.

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