Double-resonance NMR probes of structural distortions in alkali-metal-fulleride superconductors

C. H. Pennington; C. Hahm; V. A. Stenger; K. Gorny; C. H. Recchia; J. A. Martindale; D. R. Buffinger; R. P. Ziebarth

doi:10.1103/PhysRevB.54.R6853

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Double-resonance NMR probes of structural distortions in alkali-metal-fulleride superconductors

C. H. Pennington, C. Hahm, V. A. Stenger, K. Gorny, C. H. Recchia, J. A. Martindale, D. R. Buffinger, R. P. Ziebarth

DOI 10.1103/PhysRevB.54.R6853 · Physical Review B

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Abstract

The Rb87 NMR line shape of the Rb3C60 superconductor contains three distinct peaks: one associated with octahedrally coordinated Rb in the fcc lattice of C60 molecules and two others, labeled T and T′, both associated with tetrahedrally coordinated Rb. This contrasts with the accepted crystal structure, in which all tetrahedral Rb sites are equivalent. We report multinuclear single and double resonance NMR experiments which probe for effects which could lead to the unexpected splitting, and discuss implications for electronic structure.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18	Pressure not reported	unknown
Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	29	Pressure not reported	unknown
Cs2RbC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	33	Pressure not reported	unknown