Urbach's Rule and Optical Properties for TlGaS_{2}

Authors: AYTUNÇ ATEŞ, BEKİR GÜRBULAK, MUHAMMET YILDIRIM, SEYDİ DOĞAN, SONGÜL DUMAN, TACETTİN YILDIRIM, SEBAHATTİN TÜZEMEN

Abstract: Absorption measurements were carried out on TlGaS_{2} sample in the temperature range between 10 and 320 K in 10 K steps. There is an abrupt change in the Urbach energy at 180 K and 280 K and steepness parameter at 120 K and 220 K .Obtained from the changing of the Urbach energy, these may be phase transition temperatures. The phonon energies calculated for TlGaS_{2} is 19.7 \pm 5 meV.

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