Anisotropic chiral d+id superconductivity in NaxCoO2 yH2O
Maximilian Kiesel, Christian Platt, Werner Hanke, Ronny, Thomale
TL;DR
This paper investigates the superconducting phase in water-intercalated sodium cobaltates, revealing an anisotropic chiral d+id wave state driven by multi-orbital effects and magnetic fluctuations, explaining experimental observations.
Contribution
It introduces a theoretical model showing the emergence of chiral d+id superconductivity in NaxCoO2 yH2O due to multi-orbital and magnetic effects.
Findings
Identifies chiral d+id wave as the superconducting state
Explains singlet pairing and nodal gap features
Links superconductivity to magnetic fluctuations
Abstract
Since its discovery, the superconducting phase in water-intercalated sodium cobaltates NaxCoO2 yH2O (x~0.3, y~1.3) has posed fundamental challenges in terms of experimental investigation and theoretical understanding. By a combined dynamical mean-field and renormalization group approach, we find an anisotropic chiral d+id wave state as a consequence of multi-orbital 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.
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