Nodal d+id Pairing and Topological Phases on the Triangular Lattice of NaxCoO2·yH2O: Evidence for an Unconventional Superconducting State
Sen Zhou, Ziqiang Wang
DOI 10.1103/PhysRevLett.100.217002 · Physical Review Letters
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Abstract
We show that finite angular momentum pairing chiral superconductors on the triangular lattice have point zeroes in the complex gap function. A topological quantum phase transition takes place through a nodal superconducting state at a specific carrier density xc where the normal state Fermi surface crosses the isolated zeros. For spin-singlet pairing, we show that the second-nearest-neighbor (d+id)-wave pairing can be the dominant pairing channel. The gapless critical state at xc≃0.25 has six Dirac points and is topologically nontrivial with a T3 spin relaxation rate below Tc. This picture provides a possible explanation for the unconventional superconducting state of NaxCoO2·yH2O. Analyzing a pairing model with strong correlation using the Gutzwiller projection and symmetry arguments, we study these topological phases and phase transitions as a function of Na doping.
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. | 5 | Pressure not reported | unknown |
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