We present a thorough study on the magnetoanisotropic properties and
magnetocaloric effect in the layered ferromagnetic Cr4βTe5β single crystals
by performing the critical behaviour analysis of magnetization isotherms. The
critical exponents Ξ²=0.485(3), Ξ³=1.202(5), and Ξ΄=3.52(3)
with a Curie temperature of TCββ340.73(4) K are determined by the
modified Arrott plots. We observe a large magnetocrystalline anisotropy
Kuβ=330 kJ/m3 at 3 K which gradually decreases with increasing
temperature. Maximum entropy change -ΞSMmaxβ and the relative
cooling power (RCP) are found to be 2.77 J/kgβK and 88.29 J/kg,
respectively near TCβ when the magnetic field applied parallel to
ab-plane. Rescaled -ΞSMβ(T,H) data measured at various
temperatures and fields collapse into a single universal curve, confirming the
second order magnetic transition in this system. Following the renormalization
group theory analysis, we find that the spin-coupling is of 3D Heisenberg-type,
{d:n}={3:3}, with long-range exchange interactions decaying as J(r)=rβ(d+Ο)=rβ4.71.Comment: 10 pages, 7 figure