Incommensurate phase properties of TlGaSe2 layered crystals by E. Sentürk, L. Tümbek, F. Salehli, and F. A. Mikailov

Crystal Research and Technology

Cryst. Res. Technol. 40, 248 (2005) - Abstract -

Incommensurate phase properties of TlGaSe₂ layered crystals

E. Sentürk, L. Tümbek, F. Salehli*, and F. A. Mikailov

Department of Physics, Gebze Institute of Technology, Gebze, 41400, Kocaeli, Turkey
*Department of Physics, Istanbul Technical University, 80626 Maslak, Istanbul, Turkey

Keywords	conductivity, phase transition, layered crystals, relaxation
PACS	08.15.Pq
DOI	10.1002/crat.200410333

The frequency and time dependence of the ac conductivity were measured within incommensurate phase in the frequency range 10¹-10⁷ Hz and analyzed. The electrical conductivity decreases with decreasing temperature, then saturates in mentioned temperature interval. The ac conductivity is proportional to w^s. The value f s decreases with increasing temperature which suggests hopping conduction mechanism. The time dependence of the conductivity exhibited exponential decay. It shows two conductivity relaxations in mentioned temperature interval. Moreover, the characteristic relaxation times decrease with decreasing annealing temperature. The two different relaxation times refer to two different incommensurate ordering in mentioned temperature interval.

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