engleski

Jahn–Teller effect in the organic ferromagnet TDAE–C60

We report on the measurements of the C-13 NMR lineshape in the organic ferromagnet TDAE-C-60 between room temperature and 4 K as well as on a simulation of the lineshape in this temperature interval. It is shown that the sudden increase in the inhomogeneous C-13 NMR linewidth in the middle of the ferromagnetic phase can be explained by the freeze out of the pseud-orotations of the axes of the Jahn-Teller distortions of the C-60(-) ions. The correlation times for the Jahn-Teller dynamics of the C-60(-) ions have been extracted from a comparison of experimental and simulated C-13 NMR lineshapes. A strong correlation between spin ordering and orbital ordering has been found.

fullerene ; NMR

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