Field-controlled phase separation at the impurity-induced magnetic ordering in the spin-Peierls magnet CuGeO3

TL;DR

This study investigates how an external magnetic field influences the coexistence of paramagnetic and antiferromagnetic phases in impurity-doped CuGeO3, revealing a field-dependent increase in paramagnetic fraction.

Contribution

It demonstrates the field-controlled phase separation at impurity-induced magnetic ordering in a spin-Peierls magnet, providing insights into magnetic cluster interactions.

Findings

Paramagnetic phase fraction increases with magnetic field.

External field affects the balance between Zeeman energy and exchange interactions.

Qualitative explanation based on competition between Zeeman energy and exchange interactions.

Abstract

The fraction of the paramagnetic phase surviving at the impurity-induced antiferromagnetic order transition of the doped spin-Peierls magnet Cu(1-x)Mg(x)GeO3 (x < 5%) is found to increase with an external magnetic field. This effect is qualitatively explained by the competition of Zeeman energy and exchange interaction between local antiferromagnetic clusters