Magnetism of Sigma-Phase Fe68V32 Compound

TL;DR

This study investigates the complex magnetic phases of sigma-phase Fe68V32, revealing re-entrant magnetism, spin-glass heterogeneity, and soft magnetic behavior, with quantitative analysis aligning with mean-field and Gabay-Toulouse models.

Contribution

It provides the first detailed magnetic phase diagram of sigma-Fe68V32, identifying multiple magnetic states and analyzing their characteristics using theoretical models.

Findings

Re-entrant magnetism from paramagnetic to ferromagnetic to spin-glass states.

Identification of two spin-glass sub-phases with different irreversibility.

Quantitative analysis of irreversibility and crossover temperatures consistent with mean-field theory.

Abstract

The magnetic phase diagram in the H-T coordinates has been determined for {\sigma}-Fe68V32 from the ZFC/FC magnetization measurements. The re-entrant character of magnetism, going from paramagnetic through ferromagnetic to spin-glass (SG) states, has been evidenced. The SG phase is magnetically heterogeneous, because two sub phases can be identified i.e. with the strong (SG-SI) and the weak (SG-WI) irreversibility. The ireversibility, T_irr and the crossover, T_cros, temperatures were quantitatively analysed using the mean-field theory and {\phi}_irr=1.6(2) and {\phi}_cros=0.91(9) values were obtained. A qualitative agreement with the Gabay-Toulouse model was reached. The isothermal magnetization measurements point to a soft magnetic behaviour of the studied sample. The {\gamma} critical exponent was determined with the Kouvel-Fisher approach yielding the value of {\gamma}=1.0(1) in line with the mean-field theory.