Data di Pubblicazione:
2021
Citazione:
Local structural distortions in SnTe investigated by EXAFS / P. Fornasini, R. Grisenti, M. Dapiaggi, G. Agostini. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 33:29(2021 Jun 09), pp. 295404.1-295404.11.
Abstract:
Extended x-ray absorption fine structure (EXAFS) has been measured at theKedge of Sn in SnTe in the temperature range from 5 to 480 K. EXAFS results are consistent with the presence of a local rhombohedral distortion in the full temperature range from 5 to 300 K, even well above the ferroelectric transition temperature, suggesting a partial order-disorder character of the transition. At and above 300 K, the anomalous behaviour of the third and fourth EXAFS cumulants reveals a modification of the anharmonicity of the effective pair potential, possibly connected with the softening of high frequency modes or to the presence of multiple phases.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
EXAFS; ferroelectric transition; local distortions; tin telluride
Elenco autori:
P. Fornasini, R. Grisenti, M. Dapiaggi, G. Agostini
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