Some optical properties of CuPd, AgPd, AuPd and CuMn, AgMn alloys

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Abstract
Measurements of the transmission and reflection coefficients have been made on evaporated films of solid solutions of Pd in Cu, Ag and Au and Mn in Cu and Ag. In the ease of the Pd alloys additional absorption attributed to resonant bound states associated with the Pd d electrons has been observed. The location and breadth of these resonant levels have been determined for the Ag and Au alloys. In Cu the resonant state absorption overlaps the Cu absorption edge and is not separable. In the CuMn and AgMn alloys the bound d states of the Mn are known to be spin split. No evidence for the optical absorption due to these states has been found in CuMn which is interpreted as implying a very small splitting energy ∼0·25 ev per spin. Weak absorption is observed in the case of AgMn alloys and this is interpreted as indicating a spin splitting energy of ∼ 1 ev per spin. In all these alloys the absorption spectra of the matrix, particularly the characteristic edges of Cu, Ag and Au, are little affected by the addition of Pd or Mn solutes. Values of the optical effective mass are given and the significance of this quantity for the AgPd alloys is discussed.

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