Theory of coherence length and phonon softening in A -15 compounds

R. N. Bhatt, P. A. Lee

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Coherence lengths and phonon softening in A -15 compounds are investigated on the basis of existing one-dimensional models and a recent three-dimensional tight-binding model. Results are found to depend sensitively on the band structure near the Fermi surface, and the tight-binding model is found to give a very short coherence length (ξ0aEFTc), in agreement with the extensive softening of finite-wave-vector phonons seen by neutron scattering. General remarks on phonon softening in models with three-dimensional peaked density of states and on some consequences of the short coherence length are made.

Original languageEnglish (US)
Pages (from-to)4288-4301
Number of pages14
JournalPhysical Review B
Issue number10
StatePublished - 1977
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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