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

Abstract

We report normal and superconducting properties of the Rashba-type noncentrosymmetric com- pound 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-principle 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.

8 pages, 6 figures, 1 table, accepted for publication in Phys. Rev. B

References in corpus (7)

• Electron Correlation and Pairing States in Superconductors without Inversion Symmetry
• Hole-doping-induced changes in the electronic structure of La${}_{1-x}$Sr${}_x$FeO${}_3$ : soft x-ray photoemission and absorption study of epitaxial thin films
• Single Crystal Growth and Characterization of the Iron-Based Superconductor KFe2As2 Synthesized by KAs Flux Method
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Fractional flux quanta at intrinsic metallic interfaces of noncentrosymmetric superconductors
• Modulated vortex states in Rashba non-centrosymmetric superconductors
• Pressure study of the noncentrosymmetric 5d-electron superconductors CaMSi3 (M= Ir, Pt)