DOUBLE DAVYDOV RESONANCE IN THE VIBRATIONAL-SPECTRA OF TL3ASS4 AND TL3PS4 CRYSTALS

Authors
SYRBU NN KRASOVSKY VT
Citation
Nn. Syrbu et Vt. Krasovsky, DOUBLE DAVYDOV RESONANCE IN THE VIBRATIONAL-SPECTRA OF TL3ASS4 AND TL3PS4 CRYSTALS, Physica. B, Condensed matter, 205(1), 1995, pp. 91-104
Citations number
16
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
205
Issue
1
Year of publication
1995
Pages
91 - 104
Database
ISI
SICI code
0921-4526(1995)205:1<91:DDRITV>2.0.ZU;2-B
Abstract
Raman spectra of Tl3AsS4 and Tl3PS4 have been investigated at 300 and 77 K. The vibrational modes A(g), B-1g, B-2g and B-3g are determined. The vibrational mode splittings caused by Davydov resonances are deter mined. Infrared reflectivity spectra of Tl3AsS4 and Tl3PS4 crystals ha ve been investigated for the polarizations E parallel to a, E parallel to b and E parallel to c in the range 50-4000 cm(-1). Reflectivity sp ectra contours are calculated and the main vibrational mode parameters are determined. The effective ionic charges of the anions and cations of the crystals are determined.