Ferron-like states in YBa_2Cu_3O_(6+x)

TL;DR

This paper investigates hole states in YBa_2Cu_3O_(6+x) using the Hubbard model, revealing that exchange interactions lead to large ferromagnetic clusters around holes, which may influence the material's magnetic properties.

Contribution

It demonstrates how exchange interactions in YBa_2Cu_3O_(6+x) promote ferromagnetic cluster formation around holes, providing new insights into its magnetic behavior.

Findings

Formation of large ferromagnetic clusters around holes

Exchange interaction ensures ferromagnetic ordering

Hubbard model effectively describes hole states

Abstract

With the use of the Hubbard model bound hole states in YBa_2Cu_3O_(6+x) are studied. For the parameters of this crystal the exchange interaction between the spin-carrying chain ion O^- and Cu-O plane sites is shown to ensure the formation of a large ferromagnetically ordered clusters around holes in the plane.