Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 69: Focus Session: Superconductivity in the Vicinity of a Quantum Critical Point
TT 69.7: Talk
Thursday, March 23, 2017, 18:00–18:15, HSZ 03
Approaching a Van Hove Singularity in Sr2RuO4 Using Uniaxial Stress — •Mark E. Barber1,2, Alexandra S. Gibbs1,3, Yoshiteru Maeno4, Clifford W. Hicks2, and Andrew P. Mackenzie1,2 — 1Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom — 2Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, Dresden 01187, Germany — 3ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, United Kingdom — 4Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
Sr2RuO4 is an unconventional superconductor with a well characterised Fermi liquid normal state. It is known that one of its three conduction bands lies in close proximity to a Van Hove singularity and we show that by the application of uniaxial pressure the Fermi level can be made to traverse the Van Hove singularity. For the first time we can tune through this topological Liftshitz transition using a clean and continuous tuning parameter. We observe more than a factor of 2.3 enhancement of Tc and quantum critical behaviour in the normal state properties.