Direct evidence for the absence of coupling between shear strain and superconductivity in Sr2RuO4
arXiv:2509.10215 · doi:10.1038/s41467-025-67307-1
Abstract
The superconducting symmetry of Sr2RuO4 has been intensely debated for many years. A crucial controversy recently emerged between shear-mode ultrasound experiments, which suggest a two-component order parameter, and some uniaxial pressure experiments that suggest a one-component order parameter. To resolve this controversy, we use a new approach to directly apply three different kinds of shear strain to single crystals of Sr2RuO4 and investigate the coupling to superconductivity. After characterising the strain by optical imaging, we observe variations of the transition temperature Tc smaller than 10mK/% as measured by low-frequency magnetic susceptibility, indicating that shear strain has little to no coupling to superconductivity. Our results are consistent with a one-component order parameter model, but such a model cannot consistently explain other experimental evidence such as time-reversal symmetry breaking, superconducting domains, and horizontal line nodes, thus calling for alternative interpretations.
References in corpus (21)
- Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
- High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
- Pronounced drop of O NMR Knight shift in superconducting state of SrRuO
- Strong Peak in of SrRuO Under Uniaxial Pressure
- Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in SrRuO under uniaxial stress
- Reduction of the O Knight shift in the Superconducting State and the Heat-up Effect by NMR Pulses on SrRuO
- Thermodynamic Evidence for a Two-Component Superconducting Order Parameter in SrRuO
- Ultrasound evidence for a two-component superconducting order parameter in SrRuO
- Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in SrRuO
- Evidence for even parity unconventional superconductivity in SrRuO
- Elastocaloric determination of the phase diagram of SrRuO
- High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure
- Reduction of the spin susceptibility in the superconducting state of Sr2RuO4 observed by polarized neutron scattering
- A key role of correlation effects in the Lifshitz transition in SrRuO
- Micron-scale measurements of low anisotropic strain response of local in SrRuO
- Improved Single-Crystal Growth of SrRuO
- The Superconductivity of SrRuO Under -Axis Uniaxial Stress
- Measurement of the and components of the elastoresistivity tensor for tetragonal materials via transverse resistivity configurations
- Compact AC Susceptometer for Fast Sample Characterization down to 0.1 K
- and the elastocaloric effect of SrRuO under uniaxial stress: no indications of transition splitting
- A Review of Electronic Transport in Superconducting SrRuO Junctions