Large spin-orbit splitting and weakly anisotropic superconductivity revealed with single-crystalline noncentrosymmetric CaIrSi3

G. Eguchi, H. Wadati, T. Sugiyama, E. Ikenaga, S. Yonezawa, and Y. Maeno
Phys. Rev. B 86, 184510 – Published 15 November 2012

Abstract

We report normal and superconducting properties of the Rashba-type noncentrosymmetric compound CaIrSi3 using single crystalline samples with nearly 100% superconducting volume fraction. The electronic density of states revealed by the hard x-ray photoemission spectroscopy can be well explained by the relativistic first-principles band calculation. This indicates that strong spin-orbit interaction indeed affects the electronic states of this compound. The obtained H-T phase diagram exhibits only approximately 10% anisotropy, indicating that the superconducting properties are almost three dimensional. Nevertheless, strongly anisotropic vortex pinning is observed.

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  • Received 21 August 2012

DOI:https://doi.org/10.1103/PhysRevB.86.184510

©2012 American Physical Society

Authors & Affiliations

G. Eguchi1,*, H. Wadati2, T. Sugiyama3, E. Ikenaga4, S. Yonezawa1, and Y. Maeno1

  • 1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 2Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 3Research Center for Synchrotron Light Applications, Kyushu University, Kasuga 816-8580, Japan
  • 4Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8, Kouto, Mikazuki 679-5198, Japan

  • *geguchi@scphys.kyoto-u.ac.jp

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Issue

Vol. 86, Iss. 18 — 1 November 2012

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