ROTATIONAL-DYNAMICS OF C-60 IN NA2RBC60

Authors
CHRISTIDES C PRASSIDES K NEUMANN DA COPLEY JRD MIZUKI J TANIGAKI K HIROSAWA I EBBESEN TW
Citation
C. Christides et al., ROTATIONAL-DYNAMICS OF C-60 IN NA2RBC60, Europhysics letters, 24(9), 1993, pp. 755-760
Citations number
24
Categorie Soggetti
Physics
Journal title
Europhysics letters → ACNP
ISSN journal
02955075
Volume
24
Issue
9
Year of publication
1993
Pages
755 - 760
Database
ISI
SICI code
0295-5075(1993)24:9<755:ROCIN>2.0.ZU;2-I
Abstract
We have measured the low-energy neutron inelastic-scattering (NIS) spe ctra of superconducting Na2RbC60 in the temperature range 50-350 K. We ll-defined librational peaks are observed at 50 K at 2.83(17) meV (FWH M = 1.7(5) meV). They soften and broaden with increasing temperature. Their behaviour mimics that found in solid C60 and differs markedly fr om K3C60. The rotational barrier for C60 reorientations in Na2RbC60 is somewhat higher than in pristine C60 and approximately half as large as in K3C60. An order-disorder transition is anticipated at a temperat ure higher than that found in C60.