Density of states of the superconducting fullerides Na2CsxC60 and M3−yBayC60
Hai Huang
DOI 10.1103/PhysRevB.74.132507 · Physical Review B
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Abstract
From experiment it was found that the superconducting transition temperature of the fulleride compounds Na2CsxC60 (0<x<1) and M3−yBayC60 (0.2<y<2, M=K, Rb, or Cs) drops quickly when the carrier concentration is deviated from the half filling of the t1u band. We propose an impurity model to study the density of states (DOS) of these alkali-doped C60 compounds. Based on the phase shift analysis of Friedel, we find the density of states at the Fermi level decreases sharply due to the strong s-wave scattering. This gives a reasonable explanation to the strange behavior of the superconducting transition temperature of these two families of fulleride systems.
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. | — | Pressure not reported | unknown |
| K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | unknown |
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