Joint effect of lattice interaction and potential fluctuation in colossal magnetoresistive manganites

TL;DR

This paper investigates how lattice distortions and potential fluctuations jointly influence the metal-insulator transition in manganites, revealing their combined importance in electronic localization effects.

Contribution

It introduces a theoretical model incorporating both Jahn-Teller distortions and potential fluctuations, using an inverse matrix method to analyze localization and transition phenomena.

Findings

Both lattice effects and potential fluctuations induce the metal-insulator transition.

The inverse matrix method effectively calculates localization length in the model.

Orbital configuration impacts the transition behavior.

Abstract

Taking into account both the Jahn-Teller lattice distortion and the on-site electronic potential fluctuations in the orbital-degenerated double-exchange model, in which both the core-spin and the lattice distortion are treated classically, we investigate theoretically the metal-insulator transition (MIT) in manganites by considering the electronic localization effect. An inverse matrix method is developed for calculation in which we use the inverse of the transfer matrix to obtain the localization length. We find that within reasonable range of parameters, both the lattice effect and the potential fluctuation are responsible to the occurrence of the MIT. The role of the orbital configuration is also discussed.