High-Temperature Expansion for the Orientational Specific Heat of SolidH2andD2 | Zendy

A. J. Berlinsky | Zendy; A. B. Harris | Zendy

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High-Temperature Expansion for the Orientational Specific Heat of SolidH2andD2

Author(s) -

A. J. Berlinsky,

A. B. Harris

Publication year - 1970

Publication title -

physical review. a, general physics

Language(s) - English

Resource type - Journals

ISSN - 0556-2791

DOI - 10.1103/physreva.1.878

Subject(s) - physics , specific heat , order (exchange) , coupling (piping) , lattice (music) , crystallography , condensed matter physics , materials science , chemistry , finance , acoustics , economics , metallurgy

Terms up to order (Γ/kBT)5 in the high-temperature expansion of the orientational specific heat of orthopara alloys of solid H2 or D2 are evaluated. Good agreement is obtained between theory and experiment using a Pade approximant and effective values of the quadrupolar coupling constant, Γeff/Γ0=0.83 for D2 and Γeff/Γ0=0.80 for H2, where Γ0 is the value for a rigid lattice. These values agree with other determinations of Γeff, whereas the T−2 approximation for the specific heat yields anomalously small values of Γeff.

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