Influence of the interplay between helicoidal magnetic ordering and superconductivity on the differential conductance in HoNi₂B₂C/Ag junctions

摘要

The point contact spectra of magnetic superconductor HoNi₂B₂C/Ag-based junctions is analysed in the framework of Blonder-Tinkham-Klapwijk (BTK) theory. The anomalous behavior in the dI/dV curves above the Neel temperature(T _N ∼ 5 K) is attempted to be explained by the partial suppression of superconducting gap parameter of the prevailing helical incommensurate structure Keywords Andrew reflection - differential conductivity - NS junctions - helicoidal magnetic ordering PACS Nos 74.80.Fp - 74.80.Dm - 74.25.Fy