Brillouin Spectroscopy Investigation of the Superionic Transition in CsH 2AsO 4Report as inadecuate




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Abstract : A Brillouin scattering investigation in CsH2AsO4 has been performed over a temperature range 20–200 °C which includes the superionic transition at TS ∼167 ○C. At TS, large discontinuities are observed for elastic constants C11, C33 and C*=C11+C12+2CE66-2 and above TS, a broadening of the corresponding lines takes place. In the conducting phase above TS, the spectra reveal a domain structure. The results are discussed by comparison with compounds of CsHSeO4 type. It is shown that a linear coupling between strains and mobile protons in the conducting phase can neither contribute to modification of elastic constants nor to broadening of lines. The experimental results reflect a strong general anharmonicity of the lattice dynamics in the conducting phase.





Author: Y. Luspin Y. Vaills G. Hauret

Source: https://hal.archives-ouvertes.fr/



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