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- W2045629794 abstract "We report measurements of the temperature (40 K T 200 K) and polarization (z(yy)x,z(xz)x) dependence of the integrated intensities of quasi-elastically scattered laser light ( = 514.5 nm) in a wavenumber interval of 0±3 cm-1 around the Rayleigh line at the different phase transitions in single crystals of BCCD. Large anomalies (central peaks) are observed at the transitions into the ferroelectric, the various commensurate (c,c´), and the incommensurate phases. The widths of the anomalies on the temperature scale are large in the regions of quasi-harmonic modulation of the structure, but narrow and distinct in the region of square-wave modulation in the solitonic phase of BCCD, where also unusual shapes on the T-axis are observed. The scattering phenomena at low temperatures are interpreted hypothetically as due to fluctuations caused by the formation or rearrangement of domain walls (solitons) in the lattice near the transitions between commensurate phases and by the variation in soliton density. The cc´ transitions are of the order-disorder type." @default.
- W2045629794 created "2016-06-24" @default.
- W2045629794 creator A5025312437 @default.
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- W2045629794 date "1999-12-09" @default.
- W2045629794 modified "2023-09-28" @default.
- W2045629794 title "Quasi-elastic light scattering in betaine calcium chloride dihydrate (BCCD)" @default.
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- W2045629794 doi "https://doi.org/10.1088/0953-8984/11/50/334" @default.
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