Abstract
133Cs-NMR was observed in C60 superconductors, CsxRb3-xC60 with x=1 and 2. It was found that Cs atoms are intercalated in octahedral interstitial sites of C60 fcc lattice for x=1, while for x=2 in both of the octahedral and tetrahedral interstitial sites. The shift of the 133Cs-NMR strongly suggested that the 6s electron of Cs atom is fully ionized and conduction electrons are mainly on the C60 sites. 13C-NMR was observed to study electronic states at C60 sites. It showed a monotonic increase of the superconducting transition temperature, Tc, with increasing Fermi level density of states, N(Ef), at carbon sites, where N(Ef)-2 was assumed to be proportional to 13C spin-lattice relaxation time T1 times temperature T : N(Ef)-2∝ T1T.
Original language | English |
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Pages (from-to) | 3063-3067 |
Number of pages | 5 |
Journal | Synthetic Metals |
Volume | 56 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 1993 Apr 5 |
Keywords
- C
- Cs-NMR
- NMR
- superconductor
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry