Abstract
High precision de Haas-van Alphen (dHvA) Dingle temperature measurements were carried out for six orbits in the (110) plane, in six different samples of Au (150 atomic p.p.m. Co) annealed under different conditions. No significant differences in Dingle temperature was observed due to annealing. Waveshape analysis, and observations of both fundamental and second harmonic spin-splitting zeros, revealed no significant spin-dependent scattering or exchange energy shifts of the electronic Landau level. A phase-shift analysis of the measured Dingle temperature anisotropy was carried out, with the result that d-d interaction and d wave scattering is heavily dominant. Both the Friedel sum and the impurity resistivity are correctly calculated using the dHvA-derived phase shifts, if the effect of impurity-induced strain fields is taken into account. An approximate method for obtaining a phase-shift description of these strain fields is demonstrated using the measured dHvA phase shifts and the experimental resistivity value. Finally a connection between dHvA scattering measurements and the screening of impurity states is shown.
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