Angle-resolved photoemission study of the quasi-one-dimensional superconductor β−Na0.33V2O5
K. Okazaki, A. Fujimori, T. Yamauchi, Y. Ueda
DOI 10.1103/PhysRevB.69.140506 · Physical Review B
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Abstract
We have studied the electronic structure of β−Na0.33V2O5, which becomes a superconductor under pressure, by angle-resolved photoemission spectroscopy. Clear band dispersions are observed only along the chain direction, indicating the quasi-one-dimensional (1D) electronic structure. The spectra of the V 3d band are dominated by a Gaussian-like broad feature at ∼1eV below the Fermi level (EF) with negligible intensity at EF, which we attribute to strong electron-phonon coupling as in other 1D polaronic metals. In the momentum space, the spectra show a maximum intensity at k∼±π/4b, where b is the V-V distance along the b axis, reflecting the band filling of the chain and/or ladder.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.33V2O5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | 8 GPa | unknown |
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