title: Model evidence of an anisotropic chiral d+id-wave pairing state for the water-intercalated Na(x)CoO2·yH2O superconductor.
abstract: Since its discovery, the superconducting phase in water-intercalated sodium cobaltates Na(x)CoO2·yH2O (x∼0.3, y∼1.3) has posed fundamental challenges in terms of experimental investigation and theoretical understanding. By a combined cluster calculation and renormalization group approach, we find an anisotropic chiral d+id-wave state as a consequence of multiorbital effects, Fermi surface topology, and magnetic fluctuations. It naturally explains the singlet property and close-to-nodal gap features of the superconducting phase as indicated by experiments.
authors.affiliation: Institute for Theoretical Physics, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany.
authors.forename: Maximilian L
authors.initials: ML
authors.lastname: Kiesel
authors.forename: Christian
authors.initials: C
authors.lastname: Platt
authors.forename: Werner
authors.initials: W
authors.lastname: Hanke
authors.forename: Ronny
authors.initials: R
authors.lastname: Thomale