Giant positive magnetoresistance in metallic VOx thin films

TL;DR

This paper reports a significant positive magnetoresistance effect in VOx thin films, with strong dependence on temperature and oxygen content, reaching 70% at low temperatures, and explores possible underlying mechanisms.

Contribution

It presents the observation of giant positive magnetoresistance in VOx thin films and discusses potential explanations involving electron interactions and magnetic instability.

Findings

Magnetoresistance reaches 70% at low temperatures in 5 T field

MR effect varies strongly with temperature and oxygen content

Possible mechanisms include electron-electron interactions and magnetic instability

Abstract

We report on giant positive magnetoresistance effect observed in VOx thin films, epitaxially grown on SrTiO3 substrate. The MR effect depends strongly on temperature and oxygen content and is anisotropic. At low temperatures its magnitude reaches 70% in a magnetic field of 5 T. Strong electron-electron interactions in the presence of strong disorder may qualitatively explain the results. An alternative explanation, related to a possible magnetic instability, is also discussed.