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Anharmonic Effects in the Thermal Diffuse Scattering of X‐Rays
Author(s) -
Tsarkov A. G.,
Tsirelson V. G.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221670204
Subject(s) - anharmonicity , phonon , scattering , phonon scattering , physics , condensed matter physics , thermal , crystal (programming language) , atomic physics , chemistry , optics , thermodynamics , computer science , programming language
The thermal diffuse scattering (TDS) of X‐rays in the anharmonic one‐phonon and harmonic two‐phonon approximations is considered. The complete expression for the one‐phonon intensity of X‐rays is derived by perturbation theory and presented for a polyatomic crystal in the high‐temperature limit. The method of evaluating the corrections of the X‐rays intensities for the thermal diffuse scattering is given and the importance taking into account the anharmonic effects in the one‐phonon scattering for KZnF 3 , CsCl, and YBa 2 Cu 3 O 7−δ crystals at room temperature is discussed. Anharmonic TDS‐effects achieve considerable magnitudes for soft (acoustic) anharmonic crystals as CsCl.