Magnetic anisotropy and critical behavior of the quaternary van der Waals ferromagnetic material $\mathbf{CrG}{\mathbf{e}}_{\delta }\mathbf{S}{\mathbf{i}}_{1-\delta }\mathbf{T}{\mathbf{e}}_3$

Abstract

Recently, two-dimensional ferromagnetism in the family of Chromium compounds $\mathrm{CrXT}{\mathrm{e}}_3(\mathrm{X}=\mathrm{Si},\mathrm{Ge})$ has attracted a broad research interest. Despite the structural similarity in $\mathrm{CrT}{\mathrm{e}}_6$ octahedra, the size effect of inserted Ge or Si dimer contributes to significant differences in magnetism. Here, we report a new quaternary van der Waals ferromagnetic material $\mathrm{CrG}{\mathrm{e}}_{\delta }\mathrm{S}{\mathrm{i}}_{1-\delta }\mathrm{T}{\mathrm{e}}_3$ synthesized by flux method. Ge substitution in Si site results in the lattice expansion, further increasing the Curie temperature and reducing the magnetic anisotropy. The critical behavior of $\mathrm{C}{\mathrm{r}}_{0.96}\mathrm{G}{\mathrm{e}}_{0.17}\mathrm{S}{\mathrm{i}}_{0.82}\mathrm{T}{\mathrm{e}}_3$ has been studied by specific heat as well as magnetization measurements. And the extracted critical exponents are self-consistent and well-obeying the scaling laws, which are closer to the 2D Ising model with interaction decaying as $J(r)\approx r^{-3.44}$.

References in corpus (3)

• Possible Kitaev Quantum Spin Liquid State in 2D Materials with S=3/2
• Tricritical behavior of two-dimensional intrinsic ferromagnetic semiconducting CrGeTe3
• Critical behavior of quasi-two-dimensional semiconducting ferromagnet CrGeTe${}_3$