Spin-Triplet Vortex State in the Topological Superconductor CuxBi2Se3
Pradip Das, Yusuke Suzuki, Masashi Tachiki, and Kazuo Kadowaki
TL;DR
This paper presents evidence of spin-triplet pairing in the topological superconductor CuxBi2Se3, characterized by unusual magnetization behavior and vortex state properties, supporting its classification as an odd-parity superconductor.
Contribution
The study combines experimental magnetization measurements with theoretical analysis to demonstrate spin-triplet pairing and odd parity in CuxBi2Se3, a topological superconductor.
Findings
Small magnetization in the Meissner state
Distinct magnetic-field dependence above Hc1
Consistent with spin-triplet, odd-parity pairing
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.
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