Anomalous thermal expansion of Sb 2Te 3 topological insulator

P. Dutta; D. Bhoi; A. Midya; N. Khan; P. Mandal; S. Shanmukharao Samatham; V. Ganesan

doi:10.1063/1.4730390

Anomalous thermal expansion of Sb ₂Te ₃ topological insulator

P. Dutta
, D. Bhoi
, A. Midya
, N. Khan
, P. Mandal
, S. Shanmukharao Samatham
, V. Ganesan

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We have investigated the temperature dependence of the linear thermal expansion along the hexagonal c axis (ΔL), in-plane resistivity (ρ), and specific heat (C _p) of the topological insulator Sb ₂Te ₃ single crystal. ΔL exhibits a clear anomaly in the temperature region 204-236 K. The coefficient of linear thermal expansion α decreases rapidly above 204 K, passes through a deep minimum at around 225 K, and then increases abruptly in the region 225-236 K. α is negative in the interval 221-228 K. The temperature dependence of both α and C _p can be described well by the Debye model from 2 to 290 K, excluding the region around the anomaly in α.

Original language	English
Article number	251912
Journal	Applied Physics Letters
Volume	100
Issue number	25
DOIs	https://doi.org/10.1063/1.4730390
State	Published - Jun 18 2012
Externally published	Yes

Funding

We would like to thank A. Pal and S. Das for their help during the sample preparation and measurements. P. Dutta would like to thank CSIR, India for Junior Research fellowship (File no. 09/489(0086)/2010-EMR-I). V. Ganesan also thanks Director and Centre Director, UGC-DAE CSR, Indore for their support and the DST for the LTHM project.

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title = "Anomalous thermal expansion of Sb 2Te 3 topological insulator",

abstract = "We have investigated the temperature dependence of the linear thermal expansion along the hexagonal c axis (ΔL), in-plane resistivity (ρ), and specific heat (C p) of the topological insulator Sb 2Te 3 single crystal. ΔL exhibits a clear anomaly in the temperature region 204-236 K. The coefficient of linear thermal expansion α decreases rapidly above 204 K, passes through a deep minimum at around 225 K, and then increases abruptly in the region 225-236 K. α is negative in the interval 221-228 K. The temperature dependence of both α and C p can be described well by the Debye model from 2 to 290 K, excluding the region around the anomaly in α.",

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AU - Dutta, P.

AU - Bhoi, D.

AU - Midya, A.

AU - Khan, N.

AU - Mandal, P.

AU - Shanmukharao Samatham, S.

AU - Ganesan, V.

PY - 2012/6/18

Y1 - 2012/6/18

N2 - We have investigated the temperature dependence of the linear thermal expansion along the hexagonal c axis (ΔL), in-plane resistivity (ρ), and specific heat (C p) of the topological insulator Sb 2Te 3 single crystal. ΔL exhibits a clear anomaly in the temperature region 204-236 K. The coefficient of linear thermal expansion α decreases rapidly above 204 K, passes through a deep minimum at around 225 K, and then increases abruptly in the region 225-236 K. α is negative in the interval 221-228 K. The temperature dependence of both α and C p can be described well by the Debye model from 2 to 290 K, excluding the region around the anomaly in α.

AB - We have investigated the temperature dependence of the linear thermal expansion along the hexagonal c axis (ΔL), in-plane resistivity (ρ), and specific heat (C p) of the topological insulator Sb 2Te 3 single crystal. ΔL exhibits a clear anomaly in the temperature region 204-236 K. The coefficient of linear thermal expansion α decreases rapidly above 204 K, passes through a deep minimum at around 225 K, and then increases abruptly in the region 225-236 K. α is negative in the interval 221-228 K. The temperature dependence of both α and C p can be described well by the Debye model from 2 to 290 K, excluding the region around the anomaly in α.

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VL - 100

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 25

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ER -

Anomalous thermal expansion of Sb ₂Te ₃ topological insulator

Abstract

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