Negative Magnetoresistance in Amorphous Indium Oxide Wires

TL;DR

This study investigates the magneto-transport properties of amorphous Indium oxide nanowires, revealing negative magnetoresistance at low fields and its dependence on temperature and wire dimensions, linked to competing field-dependent effects.

Contribution

It provides new insights into the negative magnetoresistance phenomenon in amorphous Indium oxide wires and explains its dependence on wire size and temperature through field-dependent interactions.

Findings

Negative magnetoresistance observed in wires ≤100 nm

Magnetoresistance magnitude depends on temperature and cross-sectional area

Broadening of R(T) explained by phase slip models

Abstract

We study magneto-transport properties of several amorphous Indium oxide nanowires of different widths. The wires show superconducting transition at zero magnetic field, but, there exist a finite resistance at the lowest temperature. The $R(T)$ broadening was explained by available phase slip models. At low field, and far below the superconducting critical temperature, the wires with diameter equal to or less than 100 nm, show negative magnetoresistance (nMR). The magnitude of nMR and the crossover field are found to be dependent on both temperature and the cross-sectional area. We find that this intriguing behavior originates from the interplay between two field dependent contributions.