Isotope effects and the charge gap formation in the charge ordered phase of colossal magnetoresistance manganites

TL;DR

This paper investigates giant oxygen isotope effects in colossal magnetoresistance manganites, explaining how isotope substitution influences charge ordering and magnetic transition temperatures through a combined double exchange and polaron model.

Contribution

It introduces a combined model of double exchange and lattice polarons to explain isotope effects on charge and magnetic transitions in manganites.

Findings

Isotope effects on $T_C$ and $T_{CO}$ are explained by polaron narrowing and double exchange factors.

The model aligns well with experimental observations of isotope effects.

Physical parameters used are reasonable and consistent with known properties.

Abstract

Giant oxygen isotope effects observed in colossal magnetoresistance manganites are investigated by employing the combined model of the double exchange and interacting lattice polaron mechanism. We have shown that the isotope effects on $ T_C$ in the metallic phase and $ T_{CO}$ in the charge ordered phase of manganites can be explained well in terms of the double exchange and polaron narrowing factors with reasonable physical parameters.