Charge Ordering Under a Magnetic Field in the Extended Hubbard Model

TL;DR

This paper investigates how magnetic fields influence charge ordering in the extended Hubbard model, revealing quadratic temperature variation at low fields and melting phenomena at intermediate fields, using the coherent potential approximation.

Contribution

It introduces a study of charge ordering under magnetic fields in the extended Hubbard model, highlighting new behaviors at different field strengths.

Findings

Quadratic variation of critical temperature with magnetic field at low H

Charge order melting at intermediate magnetic fields

Comparison of coefficient α with spin-Peierls systems

Abstract

We study the charge ordering behavior under a magnetic field $H$ in the extended Hubbard model within the coherent potential approximation. At quarter filling, for small $H$ we find that the relative variation of critical temperature is quadratic with the coefficient ${\alpha}$ smaller than the one for conventional spin-Peierls systems. For intermediate field, a melting of the charge ordering on decreasing temperature under fixed $H$ at various band filling is found.