Phase coexistence and resistivity near the ferromagnetic transition of manganites

TL;DR

This paper explains phase coexistence and resistivity near the ferromagnetic transition in manganites using the current-carrier density collapse model, providing a parameter-free, quantitative description aligned with experimental data.

Contribution

It offers a novel, model-independent explanation of phase coexistence and resistivity near the transition, based on the CCDC framework, without fitting parameters.

Findings

Quantitative description of resistivity near transition

Resistivity explained without fitting parameters

Supports CCDC as a key mechanism in manganites

Abstract

Pairing of oxygen holes into heavy bipolarons in the paramagnetic phase and their magnetic pair-breaking in the ferromagnetic phase [the so-called current-carrier density collapse (CCDC)] has accounted for the first-order ferromagnetic phase transition, colossal magnetoresistance (CMR), isotope effect, and pseudogap in doped manganites. Here we propose an explanation of the phase coexistence and describe the magnetization and resistivity of manganites near the ferromagnetic transition in the framework of CCDC. The present quantitative description of resistivity is obtained without any fitting parameters by using the experimental resistivities far away from the transition and the experimental magnetization, and essentially model independent.