Elsevier

Physica B+C

Volume 135, Issues 1–3, 2 December 1985, Pages 355-357
Physica B+C

Inelastic neutron and Raman scattering of high-Tc Nb3(Al, Ge)

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Abstract

We report on inelastic neutron and Raman scattering measurements on a Nb3 (Al, Ge) sample with 75.9 at % Nb and 6.1 at % Ge, and Tc = 19.4 K. The generalized phonon density of states G(ohms) was obtained from the inelastic neutron spectra at 300 K and 7 K. Our strongest peak in the phonon density of states at 17.6 meV at 300 K also shows up in the Raman spectrum as impurity induced scattering. In addition, the Raman spectrum reveals the two modes of Eg and F2g type allowed in A15 compounds due to symmetry. Upon cooling, the F2g phonon softens strongly and the low energy part of G(ohms) is enhanced.

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