Abstract
Recently, transport properties of Nb/CuMn (superconducting/spin glass) multilayers have been largely investigated with a particular interest to their vortex dynamics behaviour. A better understanding of the properties of these systems requires the analysis of microscopic properties such as the superconducting energy gap Δ and the density of states. For this reason we have realized and characterized high quality planar tunnel junctions based on Nb/CuMn multilayers. When changing the CuMn layer thickness d CuMn from 4 to 45 Å, keeping constant Mn concentration (2.35%) and Nb layer thickness (250 Å), a BCS-like temperature dependence with values of the zero temperature energy gap Δ(0) in the range 0.79–1.05±0.02 meV is always observed. Moreover, Δ(0) decreases when d CuMn increases, revealing a suppressing effect of the CuMn layers thickness.
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