Reduction of the spin susceptibility in the superconducting state of Sr2RuO4 observed by polarized neutron scattering

Abstract

Recent observations [A.~Pustogow et al. Nature 574, 72 (2019)] of a drop of the ${}^{17}$O nuclear magnetic resonance (NMR) Knight shift in the superconducting state of Sr${}_2$RuO${}_4$ challenged the popular picture of a chiral odd-parity paired state in this compound. Here we use polarized neutron scattering to show that there is a $34\pm 6$ % drop in the magnetic susceptibility at the ruthenium site below the superconducting transition temperature. Measurements are made at lower fields $H\sim \frac{1}{3}{H}_{c2}$ than a previous study allowing the suppression to be observed. Our results are consistent with the recent NMR observations and rule out the chiral odd-parity $\mathbf{d}=\hat{\mathbf{z}}(k_x\pm i{k}_y)$ state. The observed susceptibility is consistent with several recent proposals including even-parity $B_{1g}$ and odd-parity helical states.

arXiv commentNew version with Supplementary Material discussing orbital contributions to the susceptibility, Fermi liquid corrections and a two fluid model

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• Ultrasound evidence for a two-component superconducting order parameter in Sr${}_2$RuO${}_4$
• High sensitivity heat capacity measurements on Sr2RuO4 under uniaxial pressure
• Orientation-dependent Josephson effect in spin-singlet superconductor/altermagnet/spin-triplet superconductor junctions
• Chiral to Nematic Crossover in the Superconducting State of 4Hb-TaS${}_2$
• The Superconductivity of Sr${}_2$RuO${}_4$ Under $c$-Axis Uniaxial Stress
• Chiral singlet superconductivity in the weakly correlated metal LaPt3P
• Ubiquitous Spin Freezing in the Superconducting State of UTe2
• Superconductivity in Correlated Multi-Orbital Systems with Spin-Orbit Coupling: Coexistence of Even- and Odd-Frequency Pairing and the Case of Strontium Ruthenate
• Spontaneous superconducting diode effect in non-magnetic Nb/Ru/Sr${}_2$RuO${}_4$ topological junctions
• Constraints on the superconducting state of Sr${}_2$RuO${}_4$ from elastocaloric measurements
• Neutron scattering studies on spin fluctuations in Sr${}_2$RuO${}_4$
• Distinct spin and orbital dynamics in Sr${}_2$RuO${}_4$
• Robust Gapless Superconductivity in 4Hb-TaS${}_2$
• Destruction of surface states of ($d_{zx}+i{d}_{yz}$)-wave superconductor by surface roughness: application to Sr${}_2$RuO${}_4$
• Linear optical response from the odd parity Bardasis-Schrieffer mode in locally non-centrosymmetric superconductors
• A microscopic Ginzburg--Landau theory and singlet ordering in Sr${}_2$RuO${}_4$
• Hidden anomalous Hall effect in Sr${}_2$RuO${}_4$ with chiral superconductivity dominated by the Ru $d_{xy}$ orbital
• Multipole-fluctuation pairing mechanism of $d_{x^2-y^2}+ig$ superconductivity in Sr${}_2$RuO${}_4$
• $T_c$ and the elastocaloric effect of Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress: no indications of transition splitting
• Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
• Possibility of mixed helical p-wave pairings in Sr${}_2$RuO${}_4$
• Suppressed fluctuations as the origin of the static magnetic order in strained Sr${}_2$RuO${}_4$
• Magnetoresistance oscillation study of the half-quantum vortex in doubly connected mesoscopic superconducting cylinders of Sr2RuO4
• Inverse Proximity Effects at Spin-Triplet Superconductor-Ferromagnet Interface
• Upper Critical Field of Sr${}_2$RuO${}_4$ under In-Plane Uniaxial Pressure
• A review of some new perspectives on the theory of superconducting Sr${}_2$RuO${}_4$
• Possible two-component spin-singlet pairings in Sr2RuO4
• Effects of orbital selective dynamical correlation on the spin susceptibility and superconducting symmetries in Sr${}_2$RuO${}_4$
• A Review of Electronic Transport in Superconducting Sr${}_2$RuO${}_4$ Junctions
• Signatures of enhanced spin-triplet superconductivity induced by interfacial properties
• Surface State of Inter-orbital Pairing State in Sr${}_2$RuO${}_4$ Superconductor
• Half-quantum vortices on c-axis domain walls in chiral p-wave superconductors
• Symmetry properties of superconducting order parameter in Sr${}_2$RuO${}_4$
• Direct evidence for the absence of coupling between shear strain and superconductivity in Sr2RuO4
• Spin susceptibility of nonunitary spin-triplet superconductors
• Muon Knight shift as a precise probe of the superconducting symmetry of Sr${}_2$RuO${}_4$
• Spin Fluctuations in Sr${}_{1.8}$La${}_{0.2}$RuO${}_4$
• 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
• Current-induced superconducting anisotropy of Sr${}_2$RuO${}_4$
• Fingerprints of possible even-parity superconducting states in Sr${}_2$RuO${}_4$ detected by planar tunneling spectroscopy
• High-resolution magnetostriction measurements of the Pauli-limited superconductor Sr2RuO4
• Josephson effects in the spin-triplet superconductor/altermagnet/spin-triplet superconductor junctions: the detection of the intrinsic $\mathbf{d}$-vector