Electronic structure and superconducting energy gap in Rb3C60 single crystals studied by photoemission spectroscopy
Chun Gu, B. W. Veal, R. Liu, A. P. Paulikas, P. Kostic, H. Ding, K. Gofron, J. C. Campuzano, J. A. Schlueter, H. H. Wang, U. Geiser, J. M. Williams
DOI 10.1103/PhysRevB.50.16566 · Physical Review B
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Abstract
We report an ultrahigh-resolution photoemission study of Rb3C60 single crystals (Tc=30.5 K) and the measurement of the superconducting energy gap. The crystals were cleaved at 13 K to expose the (111) plane. They show a sharp Fermi cutoff above Tc and a superconducting gap opening below Tc (2Δ/kBTc∼4.1 at 13 K). The valence band shows a ∼0.15-eV-wide band near EF that is consistent with calculations, and a broad band at 0.15–1.3 eV, possibly contributed by the surface C60 layer.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.5 | Pressure not reported | onset |
| Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.5 | Pressure not reported | onset |
| K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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