On the magnetic phase diagram of a sigma-phase Fe47Re53 compound in the H-T plane

TL;DR

This study maps the magnetic phase diagram of sigma-phase Fe47Re53, revealing re-entrant magnetism and differences between DC and AC measurement-based diagrams, highlighting complex magnetic behavior.

Contribution

It provides the first detailed H-T magnetic phase diagrams for Fe47Re53, showing re-entrant magnetism and differences between measurement methods.

Findings

Re-entrant magnetic behavior confirmed by DC and AC measurements.

Presence of an intermediate antiferromagnetic-like phase in DC diagram.

Power-law behavior of phase boundaries with different exponents.

Abstract

Sigma-phase Fe47Re53 compound was investigated by means of in-field DC and AC magnetization measurements. Field cooled, MFC, and zero-field cooled, MZFC, DC magnetization curves were recorded in the magnetic field, H, up to 1000 Oe. AC magnetization measurements were performed at the constant frequency of 1465 Hz in the field up to H=500 Oe. Both types of measurements gave evidence in favor of a re-entrant character of magnetism in the studied sample. Based on characteristic temperatures determined from the measurements magnetic phase diagrams have been outlined in the H-T plane. The diagrams are similar but not identical. The main difference is that in the diagram constructed based on the DC data there is an intermediate antiferromagnetic-like phase which is absent in the AC diagram. Furthermore, the border lines (irreversibility, cross-over and Curie temperature) follow the power law but with correspondingly different exponents. The studied sample was also characterized by determining the effect of H on the degree of irreversibility and that of frustration.