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arxiv 2205.07094 v1 pith:2LYJ5REP submitted 2022-05-14 cond-mat.supr-con cond-mat.mes-hall

Superconducting density of states and bandstructure at the surface of the candidate topological superconductor Au2Pb

Francisco Mart\'in-Vega , Edwin Herrera , Beilun Wu , V\'ictor Barrena , Federico Mompe\'an , Mar Garc\'ia-Hern\'andez , Paul C. Canfield , Annica M. Black-Schaffer
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Jos\'e J. Baldov\'i Isabel Guillam\'on Hermann Suderow
This is my paper
classification cond-mat.supr-con cond-mat.mes-hall
keywords superconductingsurfacestatesbandstructuredensityphasetopologicalau2pb
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The electronic bandstructure of Au$_2$Pb has a Dirac cone which gaps when undergoing a structural transition into a low temperature superconducting phase. This suggests that the superconducting phase ($T_c=1.1$ K) might hold topological properties at the surface. Here we make Scanning Tunneling Microscopy experiments on the surface of superconducting Au$_2$Pb. We measure the superconducting gap and find a sizeable superconducting density of states at the Fermi level. We discuss possible origins for this finding in terms of superconductivity induced into surface states.

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