Evidence of a structural anomaly at 14 K in polymerised CsC60

Details Evidence of a structural anomaly at 14 K in polymerised CsC60 Evidence of a structural anomaly at 14 K in polymerised CsC60

2000-02-27

arxiv.org/abs/cond-mat/0002419v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 5 figures, submitted

Scientific paper

10.1209/epl/i2000-00354-1

We report the results of a high-resolution synchrotron X-ray powder diffraction study of polymerised CsC$_{60}$ in the temperature range 4 to 40 K. Its crystal structure is monoclinic (space group I2/m), isostructural with RbC$_{60}$. Below 14 K, a spontaneous thermal contraction is observed along both the polymer chain axis, $a$ and the interchain separation along [111], $d_1$. This structural anomaly could trigger the occurrence of the spin-singlet ground state, observed by NMR at the same temperature.

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