Identifying the pairing symmetry in the Sr2RuO4 superconductor

Abstract

We have analyzed heat capacity and thermal conductivity measurements of Sr2RuO4 in the normal and superconducting state and come to the conclusion that an order parameter with nodal lines on the Fermi surface is required to account for the observed low-temperature behavior. A gapped order parameter is inconsistent with the reported thermodynamic and transport data. Guided by a strongly peaked dynamical susceptibility along the diagonals of the Brillouin zone in neutron scattering data, we suggest a spin-fluctuation mechanism that would favor the pairing state with the gap maxima along the zone diagonals (such as for a d_{xy} gap). The most plausible candidates are an odd parity, spin-triplet, f-wave pairing state, or an even parity, spin-singlet, d-wave state. Based on our analysis of possible pairing functions we propose measurements of the ultrasound attenuation and thermal conductivity in the magnetic field to further constrain the list of possible pairing states.

7 pages, 5 figures; updated list of references and extended introduction; to appear in Phys. Rev. B (Oct. 2000)

References in corpus (6)

• The Order Parameter for the Superconducting Phases of UPt${}_3$
• Evidence for incommensurate spin fluctuations in Sr_2RuO_4
• Spin-triplet superconductivity in Sr${}_2$RuO${}_4$ probed by Andreev reflection
• Spin triplet superconductivity with line nodes in Sr2RuO4
• Evidence for a two component magnetic response in UPt3
• Transport in the Heavy Fermion Superconductor UPt3

Cited by in corpus (53)

• Theory of Superconductivity in Strongly Correlated Electron Systems
• Superconducting Gap Structure of Spin-Triplet Superconductor Sr_2RuO_4 Studied by Thermal Conductivity
• Gap Structure of the Spin-Triplet Superconductor Sr2RuO4 Determined from the Field-Orientation Dependence of Specific Heat
• Interband proximity effect and nodes of superconducting gap in Sr2RuO4
• Nodal Structure of Unconventional Superconductors Probed by the Angle Resolved Thermal Transport Measurements
• Ultrasound Attenuation in Sr${}_2$RuO${}_4$: an Angle-Resolved Study of the Superconducting Gap Function
• Determination of the Superconducting Gap Structure in All Bands of the Spin-Triplet Superconductor Sr2RuO4
• Interlayer Coupling and p-wave Pairing in Strontium Ruthenate
• Josephson current in s-wave superconductor / Sr_2RuO_4 junctions
• Anisotropy of magnetothermal conductivity in Sr2RuO4
• Universal Heat Transport in Sr2RuO4
• Vertical line nodes in the superconducting gap structure of Sr2RuO4
• Microscopic Identification of the D-vector in Triplet Superconductor Sr_2RuO_4
• Vanishing edge currents in non-$p$-wave topological chiral superconductors
• Vortex structure in chiral p-wave superconductors
• Theory of chiral $p$-wave superconductivity with near-nodes for Sr${}_2$RuO${}_4$
• The Resonance Peak in Sr${}_2$RuO${}_4$: Signature of Spin Triplet Pairing
• Field dependence of the vortex structure in chiral p-wave superconductors
• Josephson current between chiral superconductors
• Effect of Band Structure on the Symmetry of Superconducting States
• Edge states and determination of pairing symmetry in superconducting Sr2RuO4
• Point-contact spectroscopy in heavy-fermion superconductors
• Supercurrent in Nodal Superconductors
• Superconducting pairing in Sr${}_2$RuO${}_4$ from weak to intermediate coupling
• Electron-Phonon Interaction and Ultrasonic Attenuation in the Ruthenate and Cuprate superconductors
• Influence of the impurity scattering on charge transport in unconventional superconductor junctions
• Theory of Transport Properties in the p-wave Superconducting State of Sr2RuO4 - A Microscopic Determination of the Gap Structure -
• Pauli-paramagnetic effects on mixed state properties in a strongly anisotropic superconductor ---Application to Sr_2_RuO_4_---
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Spin polarized transport in the weak-link between $f$-wave superconductors
• Transport and the Order Parameter of Superconducting Sr${}_2$RuO${}_4$
• Mixed-Parity Superconductivity in Sr2RuO4
• Determining the superconducting gap structure in Sr2RuO4 from sound attenuation studies below Tc
• The penetration depth in Sr2RuO4: Evidence for orbital dependent superconductivity
• Raman Spectra of Triplet Superconductor in Sr${}_2$RuO${}_4$
• Josephson effect in point contacts between ''f-wave'' superconductors
• Spin triplet superconductivity in Sr2RuO4
• In-plane upper critical field anisotropy in Sr2RuO4 and CeIrIn5
• Theory of thermal and charge transport in diffusive normal metal / superconductor junctions
• Elementary vortex pinning potential in a chiral p-wave superconductor
• Low Temperature Thermal Hall Conductivity of a Nodal Chiral Superconductor
• A microscopic Ginzburg--Landau theory and singlet ordering in Sr${}_2$RuO${}_4$
• Josephson effect test for triplet pairing symmetry
• Excess current in superconducting Sr${}_2$RuO${}_4$
• Inter-orbital p- and d-wave pairings between $d_{xz/yz}$ and $d_{xy}$ orbitals in Sr${}_2$RuO${}_4$
• Critical Current of the Spin-Triplet Superconducting Phase in Sr${}_2$RuO${}_4$
• Optical conductivity of superconducting Sr_2RuO_4
• Hall Conductivity in a Spin-Triplet Superconductor
• Fluctuation Conductivity in Unconventional Superconductors near Critical Disorder
• Impurity Bound States and Symmetry of the Superconducting Order Parameter in Sr_2RuO_4
• Ultrasonic attenuation in magnetic fields for superconducting states with line nodes in Sr2RuO4
• Tunneling conductance in normal metal - triplet superconductor junction
• Anomalous Hall Effects in Chiral Superconductors