Evidence of a structural anomaly at in polymerised

S. Rouzière; S. Margadonna; K. Prassides; A. N. Fitch

doi:10.1209/epl/i2000-00354-1

All issues

Volume 51 / No 3 (August I 2000)

Europhys. Lett., 51 3 (2000) 314-319

Abstract

Issue		Europhys. Lett. Volume 51, Number 3, August I 2000


Page(s)		314 - 319
Section		Condensed matter: structure, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2000-00354-1
Published online		01 September 2002

Europhys. Lett., 51 (3), pp. 314-319 (2000)

Evidence of a structural anomaly at $\rm 14\,K$ in polymerised $\rm CsC _{60}$

S. Rouzière¹, S. Margadonna¹, K. Prassides² and A. N. Fitch¹^,2

¹ School of Chemistry, Physics and Environmental Science University of Sussex - Brighton BN1 9QJ, UK
² European Synchrotron Radiation Facility - F-38043 Grenoble, France

Received: 1 March 2000
Accepted: 25 May 2000

Abstract

We report the results of a high-resolution synchrotron X-ray powder diffraction study of polymerised $\rm CsC_{60}$ in the temperature range 4 to 40 K. Its crystal structure is monoclinic (space group I2/m), isostructural with $\rm RbC_{60}$ . Below 14 K, a spontaneous thermal contraction is observed along both the polymer chain axis, a and the interchain separation along [111], d₁. This structural anomaly could trigger the occurrence of the spin-singlet ground state, observed by NMR at the same temperature.

PACS: 61.48.+c – Fullerenes and fullerene-related materials / 61.10.Nz – Single-crystal and powder diffraction

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