Volume 118, Number 4, May 2017
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 July 2017|
Possibility for conventional superconductivity in Sr0.1Bi2Se3 from high-pressure transport studies
1 Center for High Pressure Research, School of Physics, Bharathidasan University - Tiruchirappalli-620024, India
2 School of Physical Sciences, Jawaharlal Nehru University - New Delhi, India -110067
3 Institute for Solid State Physics, University of Tokyo - Kashiwa, Chiba 277-8581, Japan
4 Quantum Phenomena and Applications Division, National Physical Laboratory (CSIR) - Dr. K. S. Krishnan Road, New Delhi-110012, India
Received: 4 May 2017
Accepted: 5 July 2017
SrxBi2Se3 is recently reported to be a superconductor derived from topological insulator Bi2Se3. It shows a maximum resistive Tc of 3.25 K at ambient pressure. We report magnetic (up to 1 GPa) and transport properties (up to 8 Gpa) under pressure for single crystalline Sr0.1Bi2Se3 superconductor. Magnetic measurements show that Tc decreases from ∼2.6 K (0 GPa) to ∼1.9 K (0.81 GPa). Similar behavior is observed in transport properties as well without much change in the metallic characteristics in normal-state resistivity. No reentrant superconducting phase (Zhou Y. et al., Phys. Rev. B, 93 (2016) 144514) is observed at high pressure. Normal-state resistivity near Tc is explained by Fermi liquid model. Band structure calculations indicate decreasing density of states at Fermi level with pressure. In consonance with transition temperature suppression in conventional BCS low-Tc superconductors, the pressure effect in SrxBi2Se3 is well accounted by pressure-induced band broadening.
PACS: 74.10.+v – Occurrence, potential candidates / 74.62.Fj – Effects of pressure / 74.25.F- – Transport properties
© EPLA, 2017
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