Direct correlation of phonon anomalies in NbC with fermi-surface-induced maxima in generalized susceptibilities

Michèle Gupta, Arthur J Freeman

Research output: Contribution to journalArticle

26 Citations (Scopus)


The generalized susceptibility of NbC, determined from its augmented plane wave energy band structure (with constant matrix elements), shows large maxima, arising in large part from Fermi surface "nesting," to occur at precisely those q→ values at which soft modes have been found in the phonon acoustic branches by Smith. These maxima can be represented by a warped cube of dimension ∼1.2(2πa) in momentum space, in striking agreement with the soft mode surface proposed by Weber.

Original languageEnglish
Pages (from-to)364-367
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 1976


ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this