Magnetic structure and charge ordering in Fe3BO5 ludwigite

TL;DR

This study investigates the complex magnetic and charge ordering phenomena in Fe3BO5 ludwigite, revealing multiple phase transitions and distinct magnetic arrangements in its ladder structures through diffraction techniques.

Contribution

It provides detailed insights into the charge and magnetic ordering transitions and the specific magnetic structures of Fe3BO5, a three-leg ladder compound, using diffraction methods.

Findings

Charge ordering occurs at 283 K with incomplete localization.

Antiferromagnetic transition at 112 K.

Ferromagnetism appears below 70 K, weak ferromagnetism below 40 K.

Abstract

The crystal and magnetic structures of the three-leg ladder compound Fe3BO5 have been investigated by single crystal x-ray diffraction and neutron powder diffraction. Fe3BO5 contains two types of three-leg spin ladders. It shows a charge ordering transition at 283 K, an antiferromagnetic transition at 112 K, ferromagnetism below 70 K and a weak ferromagnetic behavior below 40K. The x-ray data reveal a smooth charge ordering and an incomplete charge localization down to 110K. Below the first magnetic transition, the first type of ladders orders as ferromagnetically coupled antiferromagnetic chains, while below 70K the second type of ladders orders as antiferromagnetically coupled ferromagnetic chains.