Critical behavior and magnetocaloric effect of the ferromagnetic Weyl semimetal candidate Co2-xZrSn single crystals

We carried out a comprehensive investigation of the magnetic critical properties and the magnetocaloric effect of the ferromagnetic Weyl semimetal candidate Co2-xZrSn (x approximate to 0.41) single crystals. Contrary to the result of polycrystalline samples, the magnetic properties cannot be described by the mean-field model. The critical exponents beta = 0.443(1) with T-C = 192.2(1) K, gamma = 1.338(11) with T-C = 192.5(1) K, and delta = 4.14(6) at T-C similar to 192 K suggest a three-dimensional long-range magnetic coupling with the exchange distance decaying as J(r) similar to r(-4.9), which lies between the 3D Heisenberg model and the mean-field model. Moreover, the magnetic entropy change -Delta S-M gets a maximum value around T-C. The peak position of -Delta S-M exhibits a small shift toward high temperature with an increasing of field, further excluding the mean-field model. The renormalized -Delta S-M(T, H) plots fall into a universal curve, verifying a second-order phase transition and reliability of the deduced critical exponents. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A comprehensive investigation of the magnetic critical properties and the magnetocaloric effect of the ferromagnetic Weyl semimetal candidate Co2-xZrSn (x approximate to 0.41) single crystals was carried out. The results show that the magnetic properties cannot be described by the mean-field model, with critical exponents suggesting three-dimensional long-range magnetic coupling. The study also reveals a second-order phase transition and the reliability of the deduced critical exponents.