Weak electronic correlations in the cobalt oxychalcogenide superconductor Na2CoSe2O
Zhenchao Wu, Yingying Cao, Hong-Gang Luo, Yi-feng Yang
DOI 10.1103/3lf8-nvlm · Physical Review B
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Abstract
Motivated by the newly discovered Co-based superconductor Na2CoSe2O, we performed systematic calculations of its electronic band structures using the density functional theory plus the dynamical mean-field theory approaches. Our comparative studies reveal the weakly correlated and itinerant nature of the Co 3d electrons and show no sign of fluctuating local moments as expected in many other unconventional superconductors, although the Co eg orbitals are close to half filling. These suggest that Na2CoSe2O is a normal paramagnetic metal and its superconductivity might not be of strongly correlated nature, contrary to the initial speculation. We suggest future investigations of electron-phonon interactions to clarify its pairing mechanism.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na2CoSe2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | unknown |
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