Theory of Manganite Superlattice

TL;DR

This paper develops a theoretical model for manganite superlattices, incorporating key interactions and using dynamical mean field theory to analyze phase diagrams and conductivities, revealing layer-averaged properties influenced by electrostatics.

Contribution

It introduces a comprehensive theoretical framework for manganite superlattices that includes electron-electron, electron-phonon, and Jahn-Teller interactions, solved via an advanced mean field approach.

Findings

Layer properties approximate an average over individual layers.

Phase diagram and conductivities are computed.

Layer densities are determined by electrostatic considerations.

Abstract

A theoretical model is proposed for the (0,0,1) superlattice manganite system (LaMnO$_3$)$_n$(SrMnO$_3$)$_m$. The model includes the electron-electron, electron-phonon, and cooperative Jahn-Teller interactions. It is solved using a version of single-site the dynamical mean field approximation generalized to incorporate the cooperative Jahn-Teller effect. The phase diagram and conductivities are calculated. The behavior of the superlattice is found to a good approximation to be an average over the density-dependent properties of individual layers, with the density of each layer fixed by electrostatics.