Tunneling effect in triangular lattice superconductor Na xCoO2

Y. Asano, Y. Tanaka, K. Kuroki, Y. Tanuma, H. Tsuchiura, S. Kashiwaya

Research output: Contribution to journalArticlepeer-review

Abstract

The tunnel conductance in normal-metal/NaxCoO2 is studied theoretically, where NaCoO2 is a new superconductor discovered in a recent experiment. So far, it has been pointed out that superconductivity is characterized by an unconventional pairing symmetry and that the chiral symmetry may be broken down in the superconducting phase of NaxCoO2. Theoretical studies have suggested p, d and f wave pairing symmetries. We calculate the differential conductance of Na xCoO2 within the quasiclassical approximation by assuming the chiral p, chiral d and f wave symmetries. The results show the zero-bias conductance peak in the case of p and f wave symmetries in tunnel spectra.

Original languageEnglish
Pages (from-to)187-191
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - 2004 Oct
Externally publishedYes

Keywords

  • Chiral superconductivity
  • Tunnel spectra
  • Zero-energy state

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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