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Spin-triplet vortex state in the topological superconductor CuxBi2Se3

Pradip Das, Yusuke Suzuki, Masashi Tachiki, and Kazuo Kadowaki
Phys. Rev. B 83, 220513(R) – Published 23 June 2011
Physics logo See Synopsis: Odd topological superconductor

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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  • Received 29 March 2011

DOI:https://doi.org/10.1103/PhysRevB.83.220513

©2011 American Physical Society

Synopsis

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Odd topological superconductor

Published 23 June 2011

Experiments indicate that electrons pair in a spin-triplet state in the superconducting state of the topological insulator CuxBi2Se3.

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Authors & Affiliations

Pradip Das*, Yusuke Suzuki, Masashi Tachiki, and Kazuo Kadowaki

  • Institute of Materials Science and Graduate School of Pure & Applied Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan

  • *das@ims.tsukuba.ac.jp
  • tachiki@ims.tsukuba.ac.jp
  • kadowaki@ims.tsukuba.ac.jp

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Issue

Vol. 83, Iss. 22 — 1 June 2011

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