Distinct reduction of Knight shift in superconducting state of Sr${}_2$RuO${}_4$ under uniaxial strain

Abstract

Shortly after the discovery of superconductivity in Sr${}_2$RuO${}_4$, spin-triplet pairing was proposed and further corroborated by a constant Knight shift ($K$) across the transition temperature (T${}_c$). However, a recent experiment observed a drop in $K$ at T${}_c$ which becomes larger under uniaxial strain, ruling out several spin-triplet scenarios. Here we show that inter-orbital spin-triplet pairing features a d-vector that rotates when uniaxial strain is applied, leading to a larger drop in the spin polarization perpendicular to the strain direction, distinct from spin-singlet pairing. We propose that anisotropic spin polarization under strain will ultimately differentiate triplet vs.~singlet pairing.

arXiv comment4 pages, 4 figures + 4 pages, 3 figures (Supplementary Material)

References in corpus (29)

• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Strong electronic correlations from Hund's coupling
• Pronounced drop of ${}^{17}$O NMR Knight shift in superconducting state of Sr${}_2$RuO${}_4$
• Strong Peak in $T_c$ of Sr${}_2$RuO${}_4$ Under Uniaxial Pressure
• Chiral P-Wave Order in Sr_2RuO_4
• Observation of half-height magnetization steps in Sr2RuO4
• Fermi Surface, Surface States, and Surface Reconstruction in Sr2RuO4
• Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4
• Detailed Topography of the Fermi Surface of Sr2RuO4
• High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies
• Reduction of the ${}^{17}$O Knight shift in the Superconducting State and the Heat-up Effect by NMR Pulses on Sr${}_2$RuO${}_4$
• The role of spin-orbit coupling for the superconducting state in Sr_2RuO_4
• A proposal for reconciling diverse experiments on the superconducting state in Sr2RuO4
• Stabilizing Even-Parity Chiral Superconductivity in Sr${}_2$RuO${}_4$
• Superconductivity from emerging magnetic moments
• Spin-Orbit Coupling and Electronic Correlations in Sr2RuO4
• Strongly correlated materials from a numerical renormalization group perspective: How the Fermi-liquid state of Sr${}_2$RuO${}_4$ emerges
• Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy
• Superconducting order parameter of Sr${}_2$RuO${}_4$: a microscopic perspective
• Spin fluctuations in Sr2RuO4 from polarized neutron scattering: implications for superconductivity
• Superconducting Symmetries of Sr${}_2$RuO${}_4$ from First-Principles Electronic Structure
• Identifying spin-triplet pairing in spin-orbit coupled multi-band superconductors
• Magnetic response of Sr${}_2$RuO${}_4$: quasi-local spin fluctuations due to Hund's coupling
• First-principles calculations of spin-orbit effects and NMR in Sr2RuO4
• Superconducting order of ${\mathrm{Sr}}_2{\mathrm{RuO}}_4$ from a three-dimensional microscopic model
• Time-Reversal Invariant Superconductivity of Sr${}_2$RuO${}_4$ Revealed by Josephson Effects
• Exotic Cooper pairing in multi-orbital models of Sr${}_2$RuO${}_4$
• Hund's coupling stabilized superconductivity in the presence of spin-orbit interactions
• Residual spin susceptibility in the spin-triplet, orbital-singlet model

Cited by in corpus (18)

• Evidence for even parity unconventional superconductivity in Sr${}_2$RuO${}_4$
• Shadowed triplet pairings in Hund's metals with spin-orbit coupling
• Higher angular momentum pairings in interorbital shadowed-triplet superconductors: Application to Sr${}_2$RuO${}_4$
• Superconductivity in Correlated Multi-Orbital Systems with Spin-Orbit Coupling: Coexistence of Even- and Odd-Frequency Pairing and the Case of Strontium Ruthenate
• Hidden anomalous Hall effect in Sr${}_2$RuO${}_4$ with chiral superconductivity dominated by the Ru $d_{xy}$ orbital
• A microscopic Ginzburg--Landau theory and singlet ordering in Sr${}_2$RuO${}_4$
• Multipole-fluctuation pairing mechanism of $d_{x^2-y^2}+ig$ superconductivity in Sr${}_2$RuO${}_4$
• Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
• Possibility of mixed helical p-wave pairings in Sr${}_2$RuO${}_4$
• Spin susceptibility for orbital-singlet Cooper pair in the three-dimensional Sr${}_2$RuO${}_4$ superconductor
• A review of some new perspectives on the theory of superconducting Sr${}_2$RuO${}_4$
• Reconciling $\pi$ phase shift in Josephson junction experiments with even-parity superconductivity in Sr${}_2$RuO${}_4$
• Nonlocal electrodynamics and the penetration depth of superconducting Sr${}_2$RuO${}_4$
• Evolution of Interorbital Superconductor to Intraorbital Spin-Density Wave in Layered Ruthenates
• Polar Kerr Effect in Multiband Spin-Orbit Coupled Superconductors
• Finite-momentum and field-induced pairings in orbital-singlet spin-triplet superconductors
• Distinguishing $d_{xz}+i{d}_{yz}$ and $d_{x^2-y^2}$ pairing in $S{r}_{2}Ru{O}_4$ by high magnetic field H-T phase diagrams
• Efficient slave-boson approach for multiorbital two-particle response functions and superconductivity