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Fullerenes Under Pressure Studied by 13C-NMR

Published online by Cambridge University Press:  15 February 2011

Pascale Auban-Senzier ,
R. Kerkoud ,
D. Jerome ,
F. Rachdi  and
P. Bernier
Pascale Auban-Senzier
Affiliation:
Laboratoire de Physique des Solides (associé au CNRS), Université Paris-Sud, 91405 Orsay, France
R. Kerkoud
Affiliation:
Laboratoire de Physique des Solides (associé au CNRS), Université Paris-Sud, 91405 Orsay, France
D. Jerome
Affiliation:
Laboratoire de Physique des Solides (associé au CNRS), Université Paris-Sud, 91405 Orsay, France
F. Rachdi
Affiliation:
Groupe de Dynamique des Phases Condensées, Université des Sciences et Techniques du Languedoc, 34060 Montpellier, France
P. Bernier
Affiliation:
Groupe de Dynamique des Phases Condensées, Université des Sciences et Techniques du Languedoc, 34060 Montpellier, France
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Abstract

High pressure is an important parameter for the study of C60 and doped fullerenes as these molecular crystals are very compressible. 13C-NMR experiments under pressure in K3C60 have given access to the determination of the 13C Knight shift and the chemical shift of this superconducting compound. These NMR data do not reveal significant effects of Coulomb correlations in K3C60 and support a pairing mechanism for superconductivity mediated by intramolecular vibrations.

We report also a 13C-NMR investigation of Rb4C60 under pressure and temperature. The temperature dependence of the spin-lattice relaxation rate clearly shows, under pressure, the increase of a linear contribution which gradually substitutes to the exponential behaviour present at ambient pressure. The activated relaxation is attributed to intrinsic spin excitations through the direct Jahn-Teller gap whereas the closing of a small indirect gap under pressure gives rise to a semimetal and a Korringa like relaxation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 359: Symposium G – Science and Technology of Fullerene Materials , 1994 , 261
Copyright
Copyright © Materials Research Society 1995

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References

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