The Superconductivity of Sr${}_2$RuO${}_4$ Under $c$-Axis Uniaxial Stress

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 $T_{\text{c}}$ and $H_{\text{c2}}$. 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 $H_{\text{c2}}$ shows that we are indeed approaching the van Hove points, $T_{\text{c}}$ 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${}_4$.

References in corpus (10)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Superconductivity in the repulsive Hubbard model: an asymptotically exact weak-coupling solution
• The coherence-incoherence crossover and the mass-renormalization puzzles in Sr2RuO4
• Hidden quasi one-dimensional superconductivity in Sr${}_2$RuO${}_4$
• High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure
• Unsplit superconducting and time reversal symmetry breaking transitions in Sr${}_2$RuO${}_4$ under hydrostatic pressure and disorder
• Higher-Tc superconducting phase in Sr2RuO4 induced by uniaxial pressure
• Spin-orbit coupling and spin-triplet pairing symmetry in $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$
• Higher-Tc Superconducting Phase in Sr2RuO4 Induced by In-Plane Uniaxial Pressure
• Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model

Cited by in corpus (18)

• Orientation-dependent Josephson effect in spin-singlet superconductor/altermagnet/spin-triplet superconductor junctions
• Giant lattice softening at a Lifshitz transition in Sr${}_2$RuO${}_4$
• Heat capacity double transitions in time-reversal symmetry broken superconductors
• Leading superconducting instabilities in three-dimensional models for Sr2RuO4
• Multiband mean-field theory of the $d+ig$ superconductivity scenario in Sr${}_2$RuO${}_4$
• $\mu$SR measurements on Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress
• $T_c$ and the elastocaloric effect of Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress: no indications of transition splitting
• Upper Critical Field of Sr${}_2$RuO${}_4$ under In-Plane Uniaxial Pressure
• Nonlocal electrodynamics and the penetration depth of superconducting Sr${}_2$RuO${}_4$
• Direct evidence for the absence of coupling between shear strain and superconductivity in Sr2RuO4
• Pressure induced superconducting dome in LaNiGa2
• Why Scanning Tunneling Microscopy on Sr${}_2$RuO${}_4$ sometimes doesn't see the superconducting gap
• Pairing around a Single Dirac Point: A Unifying View of Kohn-Luttinger Superconductivity in Chern Bands, Quarter Metals, and Topological Surface States
• Resonant x-ray scattering study of charge-density wave correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$ under uniaxial stress
• Anomalous quasiparticle lifetime in geometric quantum critical metals
• Influence of Fermi Surface Geometry and Van Hove Singularities on the Optical Response of Sr${}_2$RuO${}_4$
• Probing multipolar order in the candidate altermagnet MnF${}_2$ through the elastocaloric effect under strain
• High-resolution magnetostriction measurements of the Pauli-limited superconductor Sr2RuO4