Three-dimensional ferromagnetism and magnetotransport in van der Waals Mn-intercalated tantalum disufide
Yu Liu, Zhixiang Hu, Eli Stavitski, Klaus Attenkofer, C. Petrović
Abstract
Van der Waals (vdW) ferromagnets are an important class of materials for spintronics applications. The recent discovery of atomically vdW magnets ${\mathrm{CrI}}_{3}$ and ${\mathrm{Cr}}_{2}{\mathrm{Ge}}_{2}{\mathrm{Te}}_{6}$ has triggered a renaissance in the area of two-dimensional (2D) magnetism. Herein we systematically studied 2H-${\mathrm{Mn}}_{0.28}{\mathrm{TaS}}_{2}$ single crystal, a 2D vdW ferromagnet with ${T}_{c}\ensuremath{\sim}82.3\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and a large in-plane magnetic anisotropy. Mn $K$-edge x-ray absorption spectroscopy was measured to provide information on its electronic state and local atomic environment. The detailed magnetic isotherms measured in the vicinity of ${T}_{c}$ indicates that the spin coupling inside 2H-${\mathrm{Mn}}_{0.28}{\mathrm{TaS}}_{2}$ is of a 3D Heisenberg type coupled with the attractive long-range interaction between spins that decay as $J(r)\ensuremath{\approx}{r}^{\ensuremath{-}4.85}$. Both resistivity $\ensuremath{\rho}(T)$ and thermopower $S(T)$ exhibit anomalies near ${T}_{c}$, confirming that the hole-type transport carriers strongly interact with local moments. An unusual angle-dependent magnetoresistance is further observed, suggesting a possible field-induced novel magnetic structure.