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A model of tunneling point defect in a quantum crystal at finite temperature

โœ Scribed by A. Landesman

Publisher
Springer US
Year
1978
Tongue
English
Weight
381 KB
Volume
30
Category
Article
ISSN
0022-2291

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โœฆ Synopsis

With a very simple model, using the Kubo method, we treat the effect of phonons on the tunneling of a point defect in a quantum crystal and find the results of Kagan and Klinger. We concentrate on the case where spins play no part and consider in some detail the case of a vacancy in solid 4He. Some of our conclusions apply also to the decrease of the diffusion coefficient with temperature recently observed for 3He impurities in solid 4He.

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Structure of defective crystals at finite temperatures: A quasi-harmonic lattice dynamics approach
โœ Arash Yavari; Arzhang Angoshtari ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 535 KB

In this paper we extend the classical method of lattice dynamics to defective crystals with partial symmetries. We start by a nominal defect configuration and first relax it statically. Having the static equilibrium configuration, we use a quasi-harmonic lattice dynamics approach to approximate the