title: Strong peak in Tc of Sr2RuO4 under uniaxial pressure.
abstract: Sr2RuO4is an unconventional superconductor that has attracted widespread study because of its high purity and the possibility that its superconducting order parameter has odd parity. We study the dependence of its superconductivity on anisotropic strain. Applying uniaxial pressures of up to ~1 gigapascals along a 〈100〉 direction (a axis) of the crystal lattice results in the transition temperature (Tc) increasing from 1.5 kelvin in the unstrained material to 3.4 kelvin at compression by ≈0.6%, and then falling steeply. Calculations give evidence that the observed maximum Tcoccurs at or near a Lifshitz transition when the Fermi level passes through a Van Hove singularity, and open the possibility that the highly strained, Tc= 3.4 K Sr2RuO4has an even-parity, rather than an odd-parity, order parameter.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany. steppke@cpfs.mpg.de steven.simon@physics.ox.ac.uk mackenzie@cpfs.mpg.de hicks@cpfs.mpg.de.|Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.
authors.forename: Alexander
authors.initials: A
authors.lastname: Steppke
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.|Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.
authors.forename: Lishan
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.|Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Barber
authors.affiliation: Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, U.K.
authors.forename: Thomas
authors.initials: T
authors.lastname: Scaffidi
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Fabian
authors.initials: F
authors.lastname: Jerzembeck
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany.
authors.forename: Helge
authors.initials: H
authors.lastname: Rosner
authors.affiliation: Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.|ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, U.K.
authors.forename: Alexandra S
authors.initials: AS
authors.lastname: Gibbs
authors.affiliation: Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Maeno
authors.affiliation: Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, U.K. steppke@cpfs.mpg.de steven.simon@physics.ox.ac.uk mackenzie@cpfs.mpg.de hicks@cpfs.mpg.de.
authors.forename: Steven H
authors.initials: SH
authors.lastname: Simon
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany. steppke@cpfs.mpg.de steven.simon@physics.ox.ac.uk mackenzie@cpfs.mpg.de hicks@cpfs.mpg.de.|Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Mackenzie
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany. steppke@cpfs.mpg.de steven.simon@physics.ox.ac.uk mackenzie@cpfs.mpg.de hicks@cpfs.mpg.de.
authors.forename: Clifford W
authors.initials: CW
authors.lastname: Hicks