Neutron-scattering study of(n=3,6) librations in alkali-metal fullerides
- 1 November 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 46 (18), 12088-12091
- https://doi.org/10.1103/physrevb.46.12088
Abstract
We have measured the low-energy inelastic neutron scattering spectra of superconducting and insulating . Well-defined peaks are observed at room temperature at 3.59(4) meV [full width at half maximum (FWHM) =1.11(15) meV] and 5.49(38) meV [FWHM = 3.41(44) meV], respectively. They harden with decreasing temperature and the dependence of their intensities on the scattering vector shows that they are due to small-amplitude librational motion. No anomalous behavior of the librational peak was observed on cooling through the superconducting transition temperature, indicating that electron-librational coupling is weak. The energy barrier for reorientation is estimated to be at least twice as large in as in . Substantial disorder persists for in the superconducting state.
Keywords
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