The Competition between Staggered Field and Antiferromagnetic Interactions in Cugeo3:Fe

TL;DR

This study investigates how staggered magnetic fields and antiferromagnetic interactions compete in CuGeO3:Fe, revealing their effects on electron paramagnetic resonance spectra and magnetic moments orientation at low temperatures.

Contribution

It applies Oshikawa-Affleck theory to analyze EPR spectra, highlighting the competition between magnetic interactions and the orientation of magnetic moments in CuGeO3:Fe.

Findings

Line width and g-factor depend on temperature due to competing interactions.

Staggered magnetic moments are mainly aligned along the b axis.

Analysis confirms the role of interchain antiferromagnetic interactions.

Abstract

The EPR spectra along different crystallographic axes for single crystals of CuGeO3 containing 1% of Fe impurity have been studied in the frequency range 60-360 GHz at temperatures 0.5-30 K. The analysis based on the Oshikawa-Affleck (OA) theory suggests that the temperature dependences of the line width and g-factor are formed as a result of the competition between interchain antiferromagnetic interactions and staggered Zeeman energy. It is found that staggered magnetic moments in CuGeO3:Fe are located predominantly along b axis.