Scaling Study of the Magnetic Entropy Change in Room-Temperature Ferromagnet Cr3te4

Abstract

The intrinsic room-temperature ferromagnetism, stability in air, and easy tunability make chromium telluride Cr3Te4 a material with great promise for application in spintronics. This study investigates the magnetic entropy change (∆SM) associated with critical exponents of Cr3Te4 single crystal. Temperature-dependent ∆SM suggests a drastic entropy change caused by the transition, the parameters of which show field-dependent power-law behaviors. Fitting the ∆SM(T, H) parameters yields critical exponents α = 0.056(9), β = 0.365(4), γ = 1.212(3), δ = 4.318(1), and ∆ = 1.562(5) for H//ab, while α = −0.077(3), β = 0.369(6), γ = 1.338(1), δ = 4.620(6), and ∆ = 1.689(2) for H//c. The universality principle allows the ∆SM(T, H) to be scaled onto a single universal curve independent of external field. The direction-dependent differing critical exponents imply anisotropic magnetic couplings in Cr3Te4, which reveal a magnetic interaction of the 3D-Isingtype for H//ab while a 3D-XY one for H//c.

Keywords: Magnetic entropy change, room-temperature ferromagnet, Magnetic Anisotropy, Cr3Te4 single crystal, universality scaling