Pressure induced Superconductivity and location of Fermi energy at Dirac point in BiSbTe3
2019
We have grown single-crystal BiSbTe3 3D TI sample and studied structural, TE as well as pressure dependent magneto-transport properties. Large positive
Seebeck coefficientconfirmed the p-type nature of BiSbTe3, which is consistent with Hall measurement. We have also studied the
electronic band structureusing Laser-based
ARPES, which revealed the existence of a
Dirac-conelike metallic
surface statein BiSbTe3 with a Dirac Point situated exactly at the Fermi level. Additionally, superconductivity emerges under pressure of 8 GPa with a critical temperature of ~2.5 K. With further increase of pressure, the superconducting transition temperature (Tc) increases and at 14 GPa it shows the maximum Tc (~3.3 K).
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