Evidence from tunneling spectroscopy for a quasi-one-dimensional origin of superconductivity in Sr2RuO4

I. A. Firmo*, S. Lederer, C. Lupien, A. P. Mackenzie, J. C. Davis, S. A. Kivelson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)
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Abstract

To establish the mechanism of unconventional superconductivity in Sr2RuO4, a prerequisite is direct information concerning the momentum-space structure of the energy gaps Delta(i) (k), and in particular whether the pairing strength is stronger ("dominant") on the quasi-one-dimensional (alpha and beta) or on the quasi-two-dimensional (gamma) Fermi surfaces. We present scanning tunneling microscopy measurements of the density of states spectra in the superconducting state of Sr2RuO4 for 0.1T(c) < T < T-c and analyze them along with published thermodynamic data using a simple phenomenological model. We show that our observation of a single superconducting gap scale with maximum value 2 Delta approximate to 5T(c) along with a spectral shape indicative of line nodes is consistent, within a weak-coupling model, with magnetically mediated odd-parity superconductivity generated by dominant, near-nodal, Cooper pairing on the alpha and beta bands.

Original languageEnglish
Article number134521
Number of pages10
JournalPhysical Review. B, Condensed matter and materials physics
Volume88
Issue number13
DOIs
Publication statusPublished - 28 Oct 2013

Keywords

  • Spin-triplet superconductivity
  • Particle interference
  • Magnetic-fields
  • Fermi-surface
  • Gap structure
  • Conductivity
  • Fluctuation
  • Dependence
  • Scattering
  • Symmetry

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