Spin-orbit and crystal-field effects in AgPt dilute alloys

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Abstract
High-resolution photoemission spectra are presented of Ag-1.90 at.% Pt and Ag-10 at.% Pt alloys, together with low-temperature thermopower measurements on Ag-1.05 at.% Pt and Ag-1.28 at.% Pt samples. The photoemission data clearly show a splitting of the virtual bound Pt 5d states due to spin-orbit and crystal-field effects. A simple atomic theory, including these effects, is presented and shown to fit the photoemission data. The spin-orbit coupling is found to be only slightly reduced from the spectroscopic free-atom value. The authors show that the virtual bound state parameters extracted from the photoemission spectra can describe the experimental transport data within a free-electron phase-shift model incorporating only spin-orbit coupling. It is found to be necessary to include s and p phase shifts.