Low-temperature thermal expansion of pure and inert gas-doped fullerite C60

Автор(и)

  • A.N. Aleksandrovskii B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • B. Sundqvist Department of Experimental Physics, Umea University, SE-901 87 Umea, Sweden
  • S. Moricca Australian Nuclear Science and Technology Organisation, NSW 2234, Australia
  • V.G. Manzhelii B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.G. Gavrilko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • G.E. Gadd Australian Nuclear Science and Technology Organisation, NSW 2234, Australia
  • V.B. Esel`son B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • A.V. Dolbin B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
  • A.S. Bakai National Science Center "Kharkov Institute of Physics and Technology" 1 Akademicheskaya Str., Kharkov 61108, Ukraine
  • B.G. Udovidchenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Science of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine

DOI:

https://doi.org/10.1063/1.1542477

Ключові слова:

PACS: 74.70.Wz

Анотація

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 DL(t) on heating by DT 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.

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Опубліковано

2003-04-01

Як цитувати

(1)
Aleksandrovskii, A.; Sundqvist, B.; Moricca, S.; Manzhelii, V.; Gavrilko, V.; Gadd, G.; Esel`son, V.; Dolbin, A.; Bakai, A.; Udovidchenko, B. Low-Temperature Thermal Expansion of Pure and Inert Gas-Doped Fullerite C60. Fiz. Nizk. Temp. 2003, 29, 432-442.

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