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

I. A. Firmo,1,2,* S. Lederer,3,* C. Lupien,4 A. P. Mackenzie,5,6 J. C. Davis,1,2,5,7 and S. A. Kivelson3 1Laboratory of Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA 2CMPMS Department, Brookhaven National Laboratory, Upton, New York 11973, USA 3Department of Physics, Stanford University, Stanford, California 96305, USA 4Département de Physique & RQMP, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada 5School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KY16 9SS, UK 6Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straβe. 40, 01187 Dresden, Germany 7Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, USA (Received 26 July 2013; revised manuscript received 27 September 2013; published 28 October 2013)