Angle-resolved photoemission study of quasi-one-dimensional superconductor $\beta$-Na${}_{0.33}$V${}_2$O${}_5$

Abstract

We have studied the electronic structure of $\beta$-Na${}_{0.33}$V${}_2$O${}_5$, which becomes a superconductor under pressure, by angle-resolved photoemission spectroscopy. Clear band dispersions is 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 $\sim$ 1 eV below the Fermi level ($E_F$) with negligible intensity at $E_F$, 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 $k\sim \pm \pi /4b$, where $b$ is the V-V distance along the b-axis, reflecting the band filling of the chain and/or ladder.

4 pages, 4 figures

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• Na-ion dynamics in Quasi-1D compound NaV2O4
• Unusual Pseudogap-like Features Observed in Iron Oxypnictide Superconductors
• Investigation of lattice dynamics, magnetism and electronic transport in $\beta$-Na${}_{0.33}$V${}_2$O${}_5$
• Local singlets, frustration, and unconventional superconductivity in the organic charge-transfer solids
• Anomalous quasiparticle lifetime in geometric quantum critical metals