Strong suppression of the resistivity near the transition to superconductivity in narrow micro-bridges in external magnetic fields

TL;DR

This study investigates how reducing the width of superconducting amorphous WSi and MoSi micro-bridges below the Pearl length dramatically suppresses resistivity near the superconducting transition, revealing new transport phenomena.

Contribution

It demonstrates the suppression of resistivity and sharpening of transitions in narrow superconducting micro-bridges, highlighting the role of weak vortex pinning in these effects.

Findings

Resistivity suppression becomes more pronounced as bridge width decreases.

Excess conductivity scales inversely with bridge width.

Distinct resistive transition characteristics emerge below the Pearl length.

Abstract

We have investigated a series of superconducting bridges based on homogeneous amorphous WSi and MoSi films, with bridge widths w ranging from 2 um to 1000 um and film thicknesses d ~ 4-6 nm and 100 nm. Upon decreasing the bridge widths below the respective Pearl lengths, we observe in all cases distinct changes in the characteristics of the resistive transitions to superconductivity. For each of the films, the resistivity curves R(B,T) separate at a well-defined and field-dependent temperature T*(B) with decreasing the temperature, resulting in a dramatic suppression of the resistivity and a sharpening of the transitions with decreasing bridge width w. The associated excess conductivity in all the bridges scales as 1/w, which may suggest the presence of a highly conducting region that is dominating the electric transport in narrow bridges. We argue that this effect can only be observed in materials with sufficiently weak vortex pinning.