Spin fluctuations in Sr2RuO4 from polarized neutron scattering: implications for superconductivity

Abstract

Triplet pairing in Sr2RuO4 was initially suggested based on the hypothesis of strong ferromagnetic spin fluctuations. Using polarized inelastic neutron scattering, we accurately determine the full spectrum of spin fluctuations in Sr2RuO4. Besides the well-studied incommensurate magnetic fluctuations we do find a sizeable quasiferromagnetic signal, quantitatively consistent with all macroscopic and microscopic probes. We use this result to address the possibility of magnetically-driven triplet superconductivity in Sr2RuO4. We conclude that, even though the quasiferromagnetic signal is stronger and sharper than previously anticipated, spin fluctuations alone are not enough to generate a triplet state strengthening the need for additional interactions or an alternative pairing scenario.

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Cited by in corpus (45)

• High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies
• Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr${}_2$RuO${}_4$ under uniaxial stress
• Reduction of the ${}^{17}$O Knight shift in the Superconducting State and the Heat-up Effect by NMR Pulses on Sr${}_2$RuO${}_4$
• Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe${}_2$
• Knight Shift and Leading Superconducting Instability From Spin Fluctuations in Sr2RuO4
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Higher-order topological superconductivity: possible realization in Fermi gases and Sr${}_2$RuO${}_4$
• Magnetic response of Sr${}_2$RuO${}_4$: quasi-local spin fluctuations due to Hund's coupling
• Notes on altermagnetism and superconductivity
• Theory of Strain-Induced Magnetic Order and Splitting of $T_c$ and $T_{\mathrm{TRSB}}$ in Sr${}_2$RuO${}_4$
• Interplay of electronic and spin degrees in ferromagnetic SrRuO${}_3$: anomalous softening of magnon gap and stiffness
• The Hund-metal path to strong electronic correlations
• Higher angular momentum pairings in interorbital shadowed-triplet superconductors: Application to Sr${}_2$RuO${}_4$
• Normal state ${}^{17}$O NMR studies of Sr${}_2$RuO${}_4$ under uniaxial stress
• Superconductivity in Correlated Multi-Orbital Systems with Spin-Orbit Coupling: Coexistence of Even- and Odd-Frequency Pairing and the Case of Strontium Ruthenate
• Inter-orbital singlet pairing in Sr${}_2$RuO${}_4$: a Hund's superconductor
• Distinct reduction of Knight shift in superconducting state of Sr${}_2$RuO${}_4$ under uniaxial strain
• Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance
• Spin gap and L modulated intensity at the low-energy incommensurate magnetic fluctuations in the superconducting state of Sr2RuO4
• Magnetization-density distribution in the metallic ferromagnet SrRuO3 determined by polarized neutron diffraction
• Neutron scattering studies on spin fluctuations in Sr${}_2$RuO${}_4$
• Distinct spin and orbital dynamics in Sr${}_2$RuO${}_4$
• Multipole-fluctuation pairing mechanism of $d_{x^2-y^2}+ig$ superconductivity in Sr${}_2$RuO${}_4$
• Possibility of mixed helical p-wave pairings in Sr${}_2$RuO${}_4$
• Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
• Fluctuation-driven superconductivity in Sr${}_2$RuO${}_4$ from weak repulsive interactions
• Enhanced Seebeck coefficient through the magnetic fluctuations in Sr${}_2$Ru${}_{1-x}{M}_x$O${}_4$ ($M=$ Co, Mn)
• Electronic structure correspondence of singlet-triplet scale separation in strained Sr2RuO4
• SrRuO${}_3$-SrTiO${}_3$ heterostructure as a possible platform for studying unconventional superconductivity in Sr${}_2$RuO${}_4$
• Dual Bethe-Salpeter equation for the multi-orbital lattice susceptibility within dynamical mean-field theory
• Effects of orbital selective dynamical correlation on the spin susceptibility and superconducting symmetries in Sr${}_2$RuO${}_4$
• Magic angle of Sr${}_2$RuO${}_4$: Optimizing correlation-driven superconductivity
• Orbital dichotomy of Fermi liquid properties in Sr${}_2$RuO${}_4$ revealed by Raman spectroscopy
• Tunable electronic and magnetic phases in layered ruthenates: SrRuO3-SrTiO3 heterostructure upon strain
• Evening out the spin and charge parity to increase T${}_c$ in unconventional superconductor Sr_{2}RuO_{4}
• Magnon dispersion in ferromagnetic SrRuO${}_3$
• Orbital isotropy of magnetic fluctuations in correlated electron materials induced by Hund's exchange coupling
• Magnetic order and fluctuations in quasi-two-dimensional planar magnet Sr(Co${}_{1-x}$Ni${}_x$)${}_2$As${}_2$
• Non-Fermi-liquid behaviour and Fermi-surface expansion induced by van Hove-driven ferromagnetic fluctuations: the D-TRILEX analysis
• Spin Fluctuations in Sr${}_{1.8}$La${}_{0.2}$RuO${}_4$
• KOMPASS: the new cold neutron triple-axis-spectrometer specialized for polarization analysis
• Competing spin-fluctuations in Sr${}_2$RuO${}_4$ and their tuning through epitaxial strain
• Multi-band D-TRILEX approach to materials with strong electronic correlations
• Magnetic-field-controlled spin fluctuations and quantum criticality in Sr3Ru2O7