Superconductivity in Sn<sub>1-x</sub>In<sub>x</sub>Te thin films grown by molecular beam epitaxy
ORAL
Abstract
Sn1-xInxTe is derived from the topological crystalline insulator SnTe which becomes superconducting when doped with Indium and it is one of the top candidates for topological superconductivity [1].
Sn1-xInxTe films have been grown by molecular beam epitaxy on a Bi2Te3 buffer layer, which has a good lattice matching for the growth in the (111) direction [2]. Using in situ post-annealing procedures, we achieve robust superconductivity. To look for possible signatures of topological superconductivity, we fabricated tunnel junctions on the surface of the Sn1-xInxTe films. The tunnelling spectroscopy data shows a two-gap structure in the conductance spectra which points to the coexistence of bulk and surface superconductivity in the studied films.
[1] S. Sasaki et al., Phys. Rev. Lett. 109, 217004 (2012)
[2] A.A. Taskin et al., Phys. Rev. B 89, 121302(R) (2014)
Sn1-xInxTe films have been grown by molecular beam epitaxy on a Bi2Te3 buffer layer, which has a good lattice matching for the growth in the (111) direction [2]. Using in situ post-annealing procedures, we achieve robust superconductivity. To look for possible signatures of topological superconductivity, we fabricated tunnel junctions on the surface of the Sn1-xInxTe films. The tunnelling spectroscopy data shows a two-gap structure in the conductance spectra which points to the coexistence of bulk and surface superconductivity in the studied films.
[1] S. Sasaki et al., Phys. Rev. Lett. 109, 217004 (2012)
[2] A.A. Taskin et al., Phys. Rev. B 89, 121302(R) (2014)
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Presenters
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Andrea Bliesener
Institute of Physics II, University of Cologne
Authors
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Andrea Bliesener
Institute of Physics II, University of Cologne
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Junya Feng
Institute of Physics II, University of Cologne
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Alexey A Taskin
Osaka University, Institute of Physics II, University of Cologne
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Yoichi Ando
Univ. Cologne, University of Cologne, Osaka University, Institute of Physics II, University of Cologne