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Long‐Wavelength Optical Phonons in K 1− x Tl x Cl and K 1− x Tl x Br Mixed Crystals
Author(s) -
Bauhofer W.,
Genzel L.
Publication year - 1974
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.2220620204
Subject(s) - phonon , lattice vibration , physics , infrared , lattice (music) , reflectivity , wavelength , condensed matter physics , crystallography , analytical chemistry (journal) , chemistry , optics , chromatography , acoustics
The q ≈ 0 lattice vibrations of mixed crystals of K 1− x Tl x Cl and K 1− x Tl x Br have been observed by far infrared reflectivity measurements. Contrary to the existing assumption, the system K 1− x Tl x Cl clearly shows a mixed‐mode behaviour similar to that of K 1− x Rb x I. K 1− x Tl x Br is either a mixed‐ or a two‐mode system. The experimental results are in good agreement with a modified version of the REI‐model.