Abstract
Charge transport across a disordered normal–superconductor (DN–S) interface wasstudied using a macroscopic, molecularly linked Au nanoparticle film as the DNcomponent. Low-temperature conductance versus voltage and magnetic field exhibitzero-bias and zero-field peaks, respectively. Importantly, the latter typically exhibitsuperimposed oscillations. Such oscillations are rarely seen in other DN–S systems and areremarkable given their robustness in these macroscopic films and interfaces. A numberof observations indicate that conductance peaks and oscillations arise due to a‘reflectionless tunnelling’ process. Scattering length scales extracted from thedata using a reflectionless tunnelling picture are consistent with literature values.Factors resulting in the observation of oscillations in this system are discussed.
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