Determination of the gradient-elastic tensor in aluminium using nuclear acoustic resonance

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Abstract
Acoustic waves in metals can couple energy to the nuclear spin system via the nuclear electric quadrupole interaction. Measurements of the acoustic attenuation due to this interaction allow the determination of the components of the fourth rank tensor connecting the electric field gradient to the elastic strains. The magnitude of the two independent components (S11-S12) and S44 of the gradient-elastic tensor have been determined in aluminium single crystals and found to be mod S11-S12 mod =2.5*1015 stat C cm-3, mod S44 mod =3.0*1015 stat C cm-3. The comparison of the measured and lattice point charge value indicates the dominant effect of the conduction electrons to the electric field gradient in aluminium.