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TT: Fachverband Tiefe Temperaturen

TT 69: Focus Session: Superconductivity in the Vicinity of a Quantum Critical Point

TT 69.7: Vortrag

Donnerstag, 23. März 2017, 18:00–18:15, HSZ 03

Approaching a Van Hove Singularity in Sr₂RuO₄ Using Uniaxial Stress — •Mark E. Barber^1,2, Alexandra S. Gibbs^1,3, Yoshiteru Maeno⁴, Clifford W. Hicks², and Andrew P. Mackenzie^1,2 — 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 T_c and quantum critical behaviour in the normal state properties.