Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Superconductivity: Properties and Electronic Structure
TT 6.4: Vortrag
Montag, 7. März 2016, 10:45–11:00, H19
Sr2RuO4 at high uniaxial strain — •Alexander Steppke1, Lishan Zhao1,2, Clifford Hicks1, Daniel Brodsky1,2, Mark Barber1,2, Alexandra Gibbs3, Yoshiteru Maeno4, and Andrew Mackenzie1,2 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2University of St Andrews, UK — 3Max Planck Institute for Solid State Research, Stuttgart, Germany — 4Kyoto University, Japan
We applied high anisotropic strains to high-quality single crystals of the superconductor Sr2RuO4, to gain
information on the influence of anisotropic Fermi surface distortions on its superconductivity. Due to
proximity to a van Hove singularity, one of the Fermi surfaces distorts particularly strongly in response to
anisotropic strain [1]. The superconducting properties also vary strongly: we show susceptibility and resistivity data indicating that Tc more than doubles as strain is applied, and passes through a sharp peak. Similarly, the upper critical field Hc2 for fields both parallel and perpendicular to the crystallographic c axis increases substantially. For fields perpendicular to the c axis, there is strongly hysteretic behaviour at low temperatures, that may be due to Pauli limiting.
C. W. Hicks et al., Science 344, 283 (2014)