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Phonon Dispersion Curves of the Superconducting A15 Compounds Nb 3 Ge and Nb 3 (Al–Ge)
Author(s) -
Gupta V. B.,
Gupta H. C.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221460209
Subject(s) - phonon , superconductivity , condensed matter physics , dispersion (optics) , raman spectroscopy , dispersion relation , force constant , symmetry (geometry) , materials science , germanium , physics , optics , mathematics , quantum mechanics , silicon , molecule , geometry , metallurgy
The phonon dispersion relations of superconducting compound Nb 3 Ge are calculated using an angular force constant model, the analysis being limited to third neighbour interactions only. The force constants are evaluated by fitting them to the measured values of phonons at the zone centre. The calculated results are found to be in very good agreement with the experiment in the case of Nb 3 Ge. With the help of this analysis the complete set of phonon dispersion relations in Nb 3 (Al–Ge) along the principal symmetry directions is determined. The obtained results nearly reproduce the measured Raman active phonons for Nb 3 (Al–Ge).