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Low-temperature heat capacity of fullerite C-60 doped with deuteromethane
Umeå University, Faculty of Science and Technology, Department of Physics.
2012 (English)In: Low temperature physics (Woodbury, N.Y., Print), ISSN 1063-777X, E-ISSN 1090-6517, Vol. 38, no 1, 67-73 p.Article in journal (Refereed) Published
Abstract [en]

The heat capacity C of fullerite doped with deuteromethane (CD4)(0.4)(C-60) has been investigated in the temperature interval 1.2-120K. The contribution Delta C-CD4 of the CD4 molecules to the heat capacity C has been isolated. It is shown that at T approximate to 120K the rotational motion of CD4 molecules in the octahedral voids of the C-60 lattice is weakly hindered. When the temperature is lowered to 80K, the rotational motion of the CD4 molecules changes from weakly hindered rotation to libration. In the range T = 1.2-30 K, Delta C-CD4 is described quite accurately by the sum of contributions from the translational and librational vibrations and tunneling rotation of CD4 molecules. The contribution of tunneling rotation to the heat capacity Delta C-CD4(T) is dominant below 5K. The effect of nuclear-spin conversion of the CD4 molecules on the heat capacity has been observed and the characteristic times for nuclear spin conversion between the lowest levels of the A- and T-species of CD4 molecules at T < 5K have been estimated. A feature observed in Delta C-CD4(T) near T = 5.5K is most likely a manifestation of a first-order phase transition in the orientational glass form of the solution. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3677237]

Place, publisher, year, edition, pages
Melville, NY: American Institute of Physics (AIP), 2012. Vol. 38, no 1, 67-73 p.
Keyword [en]
Fullerite, C60, deuteromethane, CH4, CD4, heat capacity, specific heat capacity, molecular rotation, molecular libration, tunnelling rotation, glass, phase transition
National Category
Physical Sciences
Research subject
Solid State Physics
Identifiers
URN: urn:nbn:se:umu:diva-52859DOI: 10.1063/1.3677237ISI: 000300066100012OAI: oai:DiVA.org:umu-52859DiVA: diva2:508500
Funder
Swedish Research Council, 621-2010-3732
Note

Simultaneous publication in Fizika Nizkikh Temperatur vol 38, issue 1, pages 87-94 (2012).

Available from: 2013-02-01 Created: 2012-03-05 Last updated: 2017-12-07Bibliographically approved

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Sundqvist, Bertil

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