27 Al NMR (nuclear magnetic resonance) spectra and the spin-lattice relaxation were measured for the non-equilibrium Al-based superconductors Al 1- x Si x ( x = 0, 0.02, 0.05, 0.06 and 0.08) in the temperature range 2-300 K. The NMR data confirm a substantial enhancement of the electron-phonon interaction in the vicinity of the FCC (face-centred cubic) lattice instability in these model superconductors. The observed quadrupole effects can be interpreted in terms of a substantial distortion and disordering of the Al-based FCC lattice.
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Gippius et al. (2000) studied this question.
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