V. Brouet et al., NMR-STUDY OF THE MAGNETIC-PROPERTIES OF THE POLYMERIZED PHASE OF CS1C60, Applied physics A: Materials science & processing, 64(3), 1997, pp. 289-293
We present NMR measurements on the orthorhombic (o)-phase of CS1C60 Th
e C-13 NMR spectrum allows, when the Magic Angle Spinning (MAS) techni
que is used, to get information about the electronic structure of this
phase, which points out that the spin density is not uniformly distri
buted on the C-60 ball. An estimation of the strength of the quadrupol
ar effects on Cs-133 is then given, which shows that it is possible to
analyse the Cs-133 spin-lattice relaxation time T-1 in terms of magne
tic effects. A comparison with the T-1 of C-13 is then justified and a
llows us to point out the importance of low dimensional antiferromagne
tic fluctuations in this compound. We also investigate the nature of t
he magnetic ground state in Cs1C60: the broadening of the spectra stat
es unambiguously its magnetic nature and a detailed analysis of their
shape gives further indications on the antiferromagnetic nature of the
magnetic order, which seems characterized by a large amount of disord
er.