Magnetic Entropy in a Non-Collinear Weak Ferromagnetic YCrO3

TL;DR

This study investigates magnetic entropy changes in YCrO3 near its antiferromagnetic phase transition, revealing maximum entropy change at high fields and evidence of weak ferromagnetism.

Contribution

It provides detailed magnetic entropy measurements in YCrO3 and links entropy behavior to magnetic phase evolution and weak ferromagnetism.

Findings

Maximum entropy change of -0.38 Jkg-1K-1 at 8 Tesla

Linear entropy variation in 3-8 T fields

Deviations at lower fields indicating weak ferromagnetism

Abstract

We carried out temperature and field dependent magnetic measurements to understand the evolution of magnetic non-collinearity near antiferromagnetic phase in conjunction with the evolution of magnetic entropy near phase transition. We observed the maximum change in entropy just before magnetic ordering of Cr3+ in YCrO3 with the maximum change in magnetic entropy of -0.38 Jkg-1K-1 at 8 Tesla external field. The data is linear in higher fields 3 T - 8 T , whereas it showed deviations in the lower field region. The maximum entropy change fits well with mean field approximation at higher fields, while the observed deviation in lower field substantiates the onset of weak ferromagnetism in YCrO3.