Model Evidence of an Anisotropic Chiral d+id-Wave Pairing State for the Water-Intercalated NaxCoO2·yH2O Superconductor
Maximilian L. Kiesel, Christian Platt, Werner Hanke, Ronny Thomale
DOI 10.1103/PhysRevLett.111.097001 · Physical Review Letters
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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 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
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