Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Superconductivity: Properties and Electronic Structure 2

TT 47.7: Vortrag

Mittwoch, 22. März 2017, 17:00–17:15, HSZ 103

Upper Critical Field of Strained and Unstrained Sr2RuO4 — •Fabian Jerzembeck1, Alexander Steppke1,2, Mark E. Barber1,2, Alexandra S. Gibbs2,3, Yoshiteru Maeno4, Andrew P. Mackenzie1,2, and Clifford W. Hicks11Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, 01187 Dresden, Germany — 2Scottish Universities Physics Alliance (SUPA), School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom — 3ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 OQX, United Kingdom — 4Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

The dependence of the upper critical field Hc2 of a superconductor on temperature can provide information on structure of the gap. We have recently shown that Tc of the unconventional superconductor Sr2RuO4 can be dramatically enhanced by uniaxial pressure, most likely due to tuning one of the Fermi surfaces through a Lifshitz transition. We have also shown that the form of Hc2(T) is very different between unstressed and highly-stressed Sr2RuO4. In this talk, we present further data on Hc2 of stressed and unstressed Sr2RuO4, and discuss how pressure is modifying the gap.

[1] A. Steppke et al. arXiv:1604.06669

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