Direct observation of the superconducting gap of Sr2RuO4

M. D. Upward, L. P. Kouwenhoven, A. F. Morpurgo, N. Kikugawa, Z. Q. Mao, Y. Maeno

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31 Scopus citations


We report the direct observation of the superconducting gap of Sr2RuO4, by means of tunnelling spectroscopy. The tunneling conductance parallel to the c axis was measured using a scanning tunneling microscope operating in a dilution refrigerator. Our results show a suppression in the density of states of Sr2RuO4 which disappears at temperatures higher than Tc or in the presence of a magnetic field larger than the critical field. This demonstrates that superconductivity persists up to the crystal surface and allows us to infer a lower limit of 8.0 for 2Δmax/kTc in the bulk. We attribute this large value to a strong in-plane anisotropy of the gap.

Original languageEnglish (US)
Article number220512
Pages (from-to)2205121-2205124
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - Jun 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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