Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.1: Vortrag
Montag, 12. März 2018, 15:00–15:15, H 0110
Resistivity in the Vicinity of a Van Hove Singularity: Sr2RuO4 Under Uniaxial Pressure — •Mark E. Barber1,2, Alexandra S. Gibbs2,3, Yoshiteru Maeno4, Andrew P. Mackenzie1,2, and Clifford W. Hicks1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Scottish Universities Physics Alliance (SUPA), University of St. Andrews, United Kingdom — 3ISIS Facility, Rutherford Appleton Laboratory, United Kingdom — 4Department of Physics, Kyoto University, Japan
Sr2RuO4 is an unconventional superconductor with a well characterised Fermi liquid normal state. One of its three conduction bands is known to be in close proximity to a Van Hove singularity. We have previously shown that the application of uniaxial pressure causes Tc to pass through a strong peak at a uniaxial compression of 0.6 %, and at which Tc is more than double its value in the unstrained lattice. DFT calculations provide strong evidence that this peak coincides with tuning the Van Hove singularity to the Fermi level. Here, we present data on the normal-state resistivity as Sr2RuO4 is tuned through this peak and analyse the temperature dependence, which also appears to be consistent with a Van Hove singularity. In particular, the low-temperature resistivity also passes through a pronounced peak - arguably a surprise because the singularity affects only small sections of one Fermi surface - and at the peak its temperature dependence deviates strongly from the Fermi liquid T2 dependence.