NMR studies of superconducting Na2AC60 (A=Cs, Rb, and K) fullerides
Y. Maniwa, T. Saito, K. Kume, K. Kikuchi, I. Ikemoto, S. Suzuki, Y. Achiba, I. Hirosawa, M. Kosaka, K. Tanigaki
DOI 10.1103/PhysRevB.52.R7054 · Physical Review B
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Abstract
Multiple-nuclei NMR investigations on fullerides that contain sodium, Na2AC60 (A=K,Rb,Cs), with a simple-cubic structure are reported. The density of states at the Fermi level vs lattice constant correlation was determined. The superconductivity in Na2AC60 connot be described by the same parameters as those of the other A3C60 superconductors within the Bardeen-Cooper-Schrieffer theory. We find that structural imperfection plays an important role in determining the electronic states and onset of superconductivity in Na2AC60. Evidence for the orientational ordering transition was also found with Na23 NMR for A=Cs, Rb, and K.
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 |
| Na2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Na2KC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| KC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | onset |
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