Critical behaviors of half-metallic ferromagnet Co3Sn2S2

TL;DR

This study investigates the critical magnetic behavior of Co3Sn2S2, revealing it undergoes a second-order phase transition with long-range magnetic interactions, differing from short-range models.

Contribution

The paper provides a detailed critical exponent analysis of Co3Sn2S2, showing its deviation from universal short-range models and identifying long-range magnetic interactions.

Findings

Second-order phase transition at TC = 174 K

Critical exponents indicate long-range magnetic order

Deviation from theoretical short-range universal models

Abstract

We have investigated the critical behavior of a shandite-type half-metal ferromagnet Co3Sn2S2. It exhibits a second-order paramagnetic-ferromagnetic phase transition with TC = 174 K. To investigate the nature of the magnetic phase transition, a detailed critical exponent study has been performed. The critical components beta, gamma, and delta determined using the modified Arrott plot, the Kouvel-Fisher method as well as the critical isotherm analysis are match reasonably well and follow the scaling equation, confirming that the exponents are unambiguous and intrinsic to the material. The determined exponents of Co3Sn2S2 deviates from theoretical estimated short-range universal models. Instead, Co3Sn2S2 exhibits long-range order in the nature of magnetic interaction with the spin decay as J(r) ~ 1/r^[-(d + sigma)] with sigma = 1.28.