The superconductivity of Sr2RuO4 under c-axis uniaxial stress

Fabian Jerzembeck (), Henrik S. Røising, Alexander Steppke, Helge Rosner, Dmitry A. Sokolov, Naoki Kikugawa, Thomas Scaffidi, Steven H. Simon, Andrew P. Mackenzie () and Clifford W. Hicks ()
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Fabian Jerzembeck: Max Planck Institute for Chemical Physics of Solids
Henrik S. Røising: Nordita, KTH Royal Institute of Technology and Stockholm University
Alexander Steppke: Max Planck Institute for Chemical Physics of Solids
Helge Rosner: Max Planck Institute for Chemical Physics of Solids
Dmitry A. Sokolov: Max Planck Institute for Chemical Physics of Solids
Naoki Kikugawa: National Institute for Materials Science
Thomas Scaffidi: University of Toronto
Steven H. Simon: Rudolf Peierls Center for Theoretical Physics
Andrew P. Mackenzie: Max Planck Institute for Chemical Physics of Solids
Clifford W. Hicks: Max Planck Institute for Chemical Physics of Solids

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Applying in-plane uniaxial pressure to strongly correlated low-dimensional systems has been shown to tune the electronic structure dramatically. For example, the unconventional superconductor Sr2RuO4 can be tuned through a single Van Hove point, resulting in strong enhancement of both Tc and Hc2. Out-of-plane (c axis) uniaxial pressure is expected to tune the quasi-two-dimensional structure even more strongly, by pushing it towards two Van Hove points simultaneously. Here, we achieve a record uniaxial stress of 3.2 GPa along the c axis of Sr2RuO4. Hc2 increases, as expected for increasing density of states, but unexpectedly Tc falls. As a first attempt to explain this result, we present three-dimensional calculations in the weak interaction limit. We find that within the weak-coupling framework there is no single order parameter that can account for the contrasting effects of in-plane versus c-axis uniaxial stress, which makes this new result a strong constraint on theories of the superconductivity of Sr2RuO4.

Date: 2022
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DOI: 10.1038/s41467-022-32177-4

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