The heat capacity C of fullerite doped with deuteromethane (CD 4 ) 0.4 (C 60 ) has been investigated in the temperature interval 1.2–120 K. The contribution Δ C CD4 of the CD 4 molecules to the heat capacity C has been isolated. It is shown that at T ≈ 120 K the rotational motion of CD 4 molecules in the octahedral voids of the C 60 lattice is weakly hindered. When the temperature is lowered to 80 K, the rotational motion of the CD 4 molecules changes from weakly hindered rotation to libration. In the range T = 1.2–30 K, Δ C CD4 is described quite accurately by the sum of contributions from the translational and librational vibrations and tunneling rotation of CD 4 molecules. The contribution of tunneling rotation to the heat capacity Δ C CD4 ( T ) is dominant below 5 K. The effect of nuclear-spin conversion of the CD 4 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 CD 4 molecules at T < 5 K have been estimated. A feature observed in Δ C CD4 ( T ) near T = 5.5 K is most likely a manifestation of a first-order phase transition in the orientational glass form of the solution.
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Low-temperature heat capacity of fullerite C 60 doped with deuteromethane
Bagatskii, M. I.; Sumarokov, V. V.; Dolbin, A. V.; Sundqvist, B.
Follow Low Temperature Physics
, Volume 38 (1)
American Institute of Physics – Jan 1, 2012
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