Tc vs Carrier Concentration in Cubic Fulleride Superconductors
T. Yildirim, L. Barbedette, J. E. Fischer, C. L. Lin, J. Robert, P. Petit, T. T. M. Palstra
DOI 10.1103/PhysRevLett.77.167 · Physical Review Letters
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Abstract
The effect of carrier concentration on fulleride superconductivity is studied by x ray, Raman, magnetization, and ESR of two new cubic families: Na2CsxC60 (0<x<1) and M3−yBayC60 ( 0.2<y<2, M=K, Rb, or Cs). These are isostructural with known Pa3¯ and Fm3¯m trivalent superconductors, respectively, but with variable valence 2<n<5. Tc is peaked at or very near n=3, decreasing rapidly in either direction to <0.5K for n=2.5 and 5. These results underscore the failure of both one-electron and strong correlation models to explain the dependence of Tc on band filling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | onset |
| Na2Cs0.93C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
| Na2Cs0.88C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | onset |
| Na2Cs0.75C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | onset |
| K2.75Ba0.25C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | onset |
| Rb2.7Ba0.3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | onset |
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