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Low-temperature thermal expansion of pure and inert gas-doped fullerite C60
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2003 (English)In: Fizika Nizkikh Temperatur (Kharkov), ISSN 0132-6414 (Print) 1816-0328 (On-line), Vol. 29, no 4, 432-442 p.Article in journal (Refereed) Published
Abstract [en]

The low temperature (2–24 K) thermal expansion of pure (single-crystal and polycrystalline) C60 and polycrystalline C60 intercalated with He, Ne, Ar, and Kr has been investigated using the high-resolution capacitance dilatometer. The investigation of the time dependence of the sample length variations deltaL(t) on heating by deltaT shows that the thermal expansion is determined by the sum of positive and negative contributions, which have different relaxation times. The negative thermal expansion usually prevails at helium temperatures. The positive expansion is connected with the phonon thermalization of the system. The negative expansion is caused by reorientation of the C60 molecules. It is assumed that the reorientation is of a quantum character. The inert gas impurities affect the reorientation of the C60 molecules very strongly, especially at liquid helium temperatures. A temperature hysteresis of the thermal expansion coefficient of Kr– and He–C60 solutions has been revealed. The hysteresis is attributed to orientational polyamorphous transformation in these systems.

Place, publisher, year, edition, pages
2003. Vol. 29, no 4, 432-442 p.
Keyword [en]
Fullerenes, intercalation, thermal expansion, low temperature, inert gases, noble gases
National Category
Condensed Matter Physics
URN: urn:nbn:se:umu:diva-19129DOI: 10.1063/1.1542477OAI: diva2:201447

Also e-published as; simultaneous publication in Low Temperature Physics vol. 29, pages 324-332 (2003), ISSN 1063-777X.

Available from: 2009-03-04 Created: 2009-03-04 Last updated: 2012-10-24Bibliographically approved

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Sundqvist, Bertil
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Department of Physics
Condensed Matter Physics

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