Anomalous behaviour of the Urbach edge and phase transitions in TlGaSe2 |
| |
| Affiliation: | 1. Department of Physics & Astronomy and Wright Center for Photovoltaics Innovation & Commercialization, University of Toledo, Toledo, OH 43606, USA;2. NanoPower Research Laboratory, Rochester Institute of Technology, Rochester, NY 14623, USA;1. Universidade do Algarve, FCT, DQB and CIQA, 8005-139, Faro, Portugal;2. University of Puerto Rico, Rio Piedras Campus, PO Box 23343, San Juan, PR, 00931-3343, USA |
| |
| Abstract: | The long-wavelength tail of the optical absorption in TlGaSe2, crystals at α=30−150cm-1 is shown to obey Urbach's rule in the temperature range 4.2–294°K. The anomalous behaviour of the parameters of this rule suggests the presence of two phase transitions in TlGaSe2 at 246°K and 101°K beside the known phase transitions at 120°K and 107°K. The presence of phase transitions in TlGaSe2 at 246°K and 101°K is also confirmed by means of the heat capacity measurement. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
