Spin-Triplet Vortex State in the Topological Superconductor CuxBi2Se3

Abstract

We report on the observation of bulk superconductivity from dc magnetization measurements in a cylindrical single crystal of CuxBi2Se3. The magnitude of the magnetization in the Meissner state is very small and the magnetic-field dependence of the magnetization just above the lower critical field Hc1 is very different from those of usual type-II superconductors. We studied the character of the vortex state theoretically in a spin-triplet pairing superconductor and compared it with the experimental results. The results showed that, the superconductivity observed in CuxBi2Se3 is consistent with the spin-triplet pairing superconductivity with odd parity. We also observed a rapid relaxation phenomenon of the superconducting diamagnetism.

11 pages, 4 figures, to be published in PRB Rapid Communications

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• Studies of the superconducting properties of Sn1-xInxTe (x=0.38 to 0.45) using muon-spin spectroscopy
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• Possible structural origin of superconductivity in Sr-doped Bi2Se3
• Non-magnetic impurity effects in a three-dimensional topological superconductor: From p- to s-wave behaviors
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• Theory of low-energy behaviors in topological $s$-wave pairing superconductors
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