The Superconductivity of Sr$_2$RuO$_4$ 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; Clifford W. Hicks

doi:10.1038/s41467-022-32177-4

paper

The Superconductivity of Sr $_{2}$ RuO $_{4}$ Under $c$ -Axis Uniaxial Stress

arXiv:2111.06228 · doi:10.1038/s41467-022-32177-4

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 Sr $_{2}$ RuO $_{4}$ can be tuned through a single Van Hove singularity which results in a strong enhancement of both $T_{c}$ and $H_{c2}$ . Out-of-plane ( $c$ axis) uniaxial pressure is expected to tune the quasi-two-dimensional structure even more strongly, causing it to approach two Van Hove singularities simultaneously. Here we achieve a record value of $3.2$ GPa compression along the $c$ axis of Sr $_{2}$ RuO $_{4}$ . Although the rise in $H_{c2}$ shows that we are indeed approaching the van Hove points, $T_{c}$ is suppressed, a result that contradicts expectations based on simple two-dimensional models. As a first attempt to take the third dimension into account, we present three-dimensional calculations in the weak interaction limit, and discuss the extent to which they are consistent with observation. Our experimental results highlight the importance of out-of-plane effects in low-dimensional systems in general and provide new constraints on theories of the pairing interaction in Sr $_{2}$ RuO $_{4}$ .

The Superconductivity of Sr $_{2}$ RuO $_{4}$ Under $c$ -Axis Uniaxial Stress

Abstract

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The Superconductivity of Sr2​RuO4​ Under c-Axis Uniaxial Stress

Abstract

References in corpus (42)

Cited by in corpus (18)

The Superconductivity of Sr $_{2}$ RuO $_{4}$ Under $c$ -Axis Uniaxial Stress