Elucidation of the symmetry of superconducting gap of topological superconductor CuxBi2Se3 and other novel materials

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Two new superconductors with time-reversal invariance similar to a superconducting topological insulator CuxBi2Se3 have been discovered: one of them is a superconducting In-doped topological crystalline insulator Sn1-xInxTe; the other is a superconductor Cux(PbSe)5(Bi2Se3)6 synthesized by intercalating Cu into a topological insulator heterostructure consisting of Bi2Se3 (topological insulator) and PbSe (ordinary insulator). The point-contact spectroscopy and specific heat measurements allowed us to elucidate the symmetry of the superconducting gaps in these materials. Based on the revealed properties we proposed Sn1-xInxTe and Cux(PbSe)5(Bi2Se3)6 as candidate materials that can build a platform for the study of topological superconductivity, contributing to the development of the relevant field.