A Real Space Description of Field Induced Melting in the Charge Ordered Manganites: II. the Disordered Case

TL;DR

This study investigates how A-site disorder influences magnetic field-induced melting of charge order in half-doped manganites, revealing disorder's role in destroying or modifying charge order transitions.

Contribution

It provides a detailed Monte Carlo analysis of disorder effects on charge order melting, extending understanding to disordered systems and unifying previous findings.

Findings

Strong disorder destroys charge order without a magnetic field.

Moderate disorder allows charge order to survive at zero field but alters its field response.

Disorder broadens the transition and affects melting scales depending on bandwidth.

Abstract

We study the effect of A site disorder on magnetic field induced melting of charge order (CO) in half doped manganites using a Monte-Carlo technique. Strong A-site disorder destroys CO even without an applied field. At moderate disorder, the zero field CO state survives but has several intriguing features in its field response. Our spatially resolved results track the broadening of the field melting transition due to disorder and explain the unusual dependence of the melting scales on bandwidth and disorder. In combination with our companion paper on field melting of charge order in clean systems we provide an unified understanding of CO melting across all half doped manganites.