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We report on transport features in heavily boron doped nanocrystallinediamond (BNCD) films which are not seen in conventional (s-wave) granularsuperconductors. Observations include an anomalous resistance peak near to thesuperconducting transition temperature as well as a strong zero biasconductance peak in the current-voltage spectra. The effect of finite biascurrent on the evolution of the resistance peak is systematically investigatedin this system. The shape of the resistance-temperature curves near thecritical temperature is seen to be strongly influenced by both magnetic fieldand bias current. As the bias current is lowered the resistance peak becomesmore pronounced whereas when the magnetic field is varied the peak shiftstowards lower temperatures, the resistance upturn shows a quadratic temperaturedependence as expected for a Kondo transition. We find that a number oftransport features such as resistance peak height, zero bias conduction peakheight and width as well as magnetoresistance peaks scale according to a powerlaw dependence. We interpret these features as a result of a charge-Kondoeffect where hole dopants act as degenerate Kondo impurities by openingadditional pseudo-spin scattering channels.

Finite bias dependent evolution of superconductor-insulator transition and Zero Bias Conductance in boron doped nanodiamond films