Orientational and Magnetic Ordering of Buckyballs in TDAE-C 60

Spin ordering in the low-temperature magnetic phase is directly linked to the orientational ordering of C 60 molecules in organically doped fullerene derivatives. Electron spin resonance and alternating current susceptometry measurements on tetrakis(dimethylamino)ethylene-C 60 (TDAE-C 60 ) (Curie te...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1995-04, Vol.268 (5209), p.400-402
Main Authors: Mihailovic, D., Arcon, D., Venturini, P., Blinc, R., Omerzu, A., Cevc, P.
Format: Article
Language:English
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Summary:Spin ordering in the low-temperature magnetic phase is directly linked to the orientational ordering of C 60 molecules in organically doped fullerene derivatives. Electron spin resonance and alternating current susceptometry measurements on tetrakis(dimethylamino)ethylene-C 60 (TDAE-C 60 ) (Curie temperature T c = 16 kelvin) show a direct coupling between spin and merohedral degrees of freedom. This coupling was experimentally demonstrated by showing that ordering the spins in the magnetic phase imprints a merohedral order on the solid or, conversely, that merohedrally ordering the C 60 molecules influences the spin order at low temperature. The merohedral disorder gives rise to a distribution of π-lectron exchange interactions between spins on neighboring C 60 molecules, suggesting a microscopic origin for the observed spinglass behavior of the magnetic state.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.268.5209.400