We have measured the low-energy inelastic neutron scattering spectra of superconducting Na2CsC60 in the temperature range 100-350 K. Well-defined librational peaks are observed at 2.7(1) meV; their position and width are temperature independent. They survive well above the order-disorder transition at 299 K. A quasielastic feature with a width 1.03(6) meV at an average scattering vector of 1.09 Angstrom(-1) is observed at 350 K, arising from diffusive motion of the C-60(3-) ions. Evidence is found for influence of the Na+ ions on the rotational motion of the C-60(3-) ions.
Molecular dynamics of C-60 in superconducting Na2CsC60 / Cristofolini, Luigi; L., Vavekis; K., Prassides; K., Dianoux; A. J., Kosaka; M., Hirosawa; I., Tanigaki. - In: PHYSICA. B, CONDENSED MATTER. - ISSN 0921-4526. - 226:(1996), pp. 41-45.
Molecular dynamics of C-60 in superconducting Na2CsC60
CRISTOFOLINI, Luigi;
1996-01-01
Abstract
We have measured the low-energy inelastic neutron scattering spectra of superconducting Na2CsC60 in the temperature range 100-350 K. Well-defined librational peaks are observed at 2.7(1) meV; their position and width are temperature independent. They survive well above the order-disorder transition at 299 K. A quasielastic feature with a width 1.03(6) meV at an average scattering vector of 1.09 Angstrom(-1) is observed at 350 K, arising from diffusive motion of the C-60(3-) ions. Evidence is found for influence of the Na+ ions on the rotational motion of the C-60(3-) ions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
