Anomalous thermal expansion of Sb2Te3 topological insulator

作者：Dutta P^*; Bhoi D; Midya A; Khan N; Mandal P; Samatham S Shanmukharao; Ganesan V

来源：Applied Physics Letters, 2012, 100(25): 251912.

DOI：10.1063/1.4730390

We have investigated the temperature dependence of the linear thermal expansion along the hexagonal c axis (Delta L), in-plane resistivity (rho), and specific heat (C-p) of the topological insulator Sb2Te3 single crystal. Delta L exhibits a clear anomaly in the temperature region 204-236 K. The coefficient of linear thermal expansion alpha decreases rapidly above 204 K, passes through a deep minimum at around 225 K, and then increases abruptly in the region 225-236 K. alpha is negative in the interval 221-228 K. The temperature dependence of both alpha and C-p can be described well by the Debye model from 2 to 290 K, excluding the region around the anomaly in Delta.

• 出版日期2012-6-18