A novel picture for charge transport interpretation in epitaxial manganite thin films

TL;DR

This paper introduces a new interpretation model for charge transport in epitaxial manganite thin films, emphasizing polaronic effects and electron-phonon coupling to improve understanding of their electrical properties.

Contribution

It presents a novel charge transport interpretation incorporating polaronic effects and electron-phonon coupling, enhancing the quantitative understanding of manganite thin films.

Findings

Polaronic effects significantly improve transport curve fitting.

Current Carriers Density Collapse explains properties across metal-insulator transition.

Electron-phonon coupling parameters align with theoretical predictions.

Abstract

Transport characterizations of epitaxial La0.7Sr0.3MnO3 thin films in the thickness range 5-40 nm and 25-410 K temperature interval have been accurately collected. We show that taking into account polaronic effects allows to achieve the best ever fitting of the transport curves in the whole temperature range. The Current Carriers Density Collapse picture accurately accounts for the properties variation across the metal-insulator-transition. The electron-phonon coupling parameter estimations are in a good agreement with theoretical predictions. The results promote a clear and straightforward quantitative description of the manganite films involved in charge transport device applications.