Surface electronic Structure and magnetic properties of doped manganites

TL;DR

This paper investigates how doping affects the surface electronic structure and magnetic properties of manganites, revealing modifications in charge states, orbital splitting, and magnetic ordering at the surface.

Contribution

It provides a detailed analysis of surface effects on electronic and magnetic properties of doped manganites, highlighting the impact of broken symmetry on these characteristics.

Findings

Surface Mn ions experience reduced cubic symmetry.

Charge states of Mn ions are altered at the surface.

Surface magnetization and transport properties depend on magnetic field and temperature.

Abstract

The electronic structure and magnetic properties of La_{1-x}A_{x}MnO_3 are investigated. It is assumed that, at the outermost layer, the environment of the Mn ions does not have cubic symmetry. The e_g orbitals are split and the double exchange mechanism is weakened. The charge state of the Mn ions is modified, and the magnetic ordering of the spins tends to be antiferromagnetic. The surface magnetization and the dependence of the transport properties through the resulting surface barrier on applied magnetic field and temperature is analyzed.