Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance

Abstract

We investigated the low-energy incommensurate (IC) magnetic fluctuations in Sr${}_2$RuO${}_4$ by the high-resolution inelastic neutron scattering measurements and random phase approximation (RPA) calculations. We observed a spin resonance with energy of $\hslash {\omega }_{\text{res}}=0.56$~meV centered at a characteristic wavevector ${\mathbf{Q}}_{\text{res}}=(0.3,0.3,0.5)$. The resonance energy corresponds well to the superconducting gap $2\Delta =0.56$~meV estimated by the tunneling spectroscopy. The spin resonance shows the $L$ modulation with a maximum at around $L=0.5$. The $L$ modulated intensity of the spin resonance and our RPA calculations indicate that the superconducting gaps regarding the quasi-one-dimensional $\alpha$ and $\beta$ sheets at the Fermi surfaces have the horizontal line nodes. These results may set a strong constraint on the pairing symmetry of Sr${}_2$RuO${}_4$. We also discuss the implications on possible superconducting order parameters.

arXiv commentarXiv admin note: substantial text overlap with arXiv:1904.01234

References in corpus (32)

• Maximally localized Wannier functions: Theory and applications
• 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
• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• 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
• Evidence for incommensurate spin fluctuations in Sr_2RuO_4
• Competitions in layered ruthenates: ferro- vs. antiferromagnetism and triplet vs. singlet pairing
• A polarized neutron-scattering study of the Cooper-pair moment in Sr2RuO4
• Upper limit on spontaneous supercurrents in Sr${}_2$RuO${}_4$
• Reduction of the ${}^{17}$O Knight shift in the Superconducting State and the Heat-up Effect by NMR Pulses on Sr${}_2$RuO${}_4$
• Inelastic neutron scattering study of magnetic excitations in Sr${}_2$RuO${}_4$
• First-Order Superconducting Transition of Sr2RuO4
• Resistivity in the Vicinity of a Van Hove Singularity: Sr${}_2$RuO${}_4$ Under Uniaxial Pressure
• Direct Observation of a Uniaxial Stress-driven Lifshitz Transition in Sr${}_2$RuO${}_4$
• Vertical line nodes in the superconducting gap structure of Sr2RuO4
• Phase-sensitive tests of the pairing state symmetry in Sr2RuO4
• Spin fluctuations in Sr2RuO4 from polarized neutron scattering: implications for superconductivity
• Searching for gap zeros in Sr2RuO4 via field-angle-dependent specific-heat measurement
• Micron-scale measurements of low anisotropic strain response of local $T_c$ in Sr${}_2$RuO${}_4$
• Time-Reversal Invariant Superconductivity of Sr${}_2$RuO${}_4$ Revealed by Josephson Effects
• Sharp magnetization jump at the first-order superconducting transition in Sr2RuO4
• Nodeless spin triplet superconducting gap in Sr2RuO4
• The Resonance Peak in Sr${}_2$RuO${}_4$: Signature of Spin Triplet Pairing
• Inelastic neutron scattering study of the magnetic fluctuations in Sr${}_2$RuO${}_4$
• Lattice dynamics and electron-phonon coupling in Sr2RuO4
• Normal state ${}^{17}$O NMR studies of Sr${}_2$RuO${}_4$ under uniaxial stress
• Pauli-paramagnetic effects on mixed state properties in a strongly anisotropic superconductor ---Application to Sr_2_RuO_4_---
• Absence of a large superconductivity-induced gap in magnetic fluctuations of Sr2RuO4
• Charge/quadrupole fluctuations and gap anisotropy in BiS${}_2$-based superconductors
• Anisotropy in the Antiferromagnetic Spin Fluctuations of Sr2RuO4
• Theoretical studies for identifying horizontal line nodes via angle-resolved density of states measurements ---Application to Sr${}_2$RuO${}_4$---

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