Electrical and thermal transport in van der Waals magnets 2H-M${}_x$TaS${}_2$ (M = Mn, Co)

Abstract

We report a detailed study of electrical and thermal transport properties in 2H-M${}_x$TaS${}_2$ (M = Mn, Co) magnets where M atoms are intercalated in the van der Waals gap. The intercalation induces ferromagentism with an easy-plane anisotropy in 2H-Mn${}_x$TaS${}_2$, but ferromagnetism with a strong uniaxial anisotropy in 2H-Co${}_{0.22}$TaS${}_2$, which finally evolves into a three-dimensional antiferromagnetism in 2H-Co${}_{0.34}$TaS${}_2$. Temperature-dependent electrical resistivity shows metallic behavior for all samples. Thermopower is negative in the whole temperature range for 2H-Co${}_x$TaS${}_2$, whereas the sign changes from negative to positive with increasing Mn for 2H-Mn${}_x$TaS${}_2$. The diffusive thermoelectric response dominates in both high- and low-temperature ranges for all samples. A clear kink in electrical resistivity, a weak anomaly in thermal conductivity, as well as a slope change in thermopower were observed at the magnetic transitions for 2H-Mn${}_{0.28}$TaS${}_2$ ($T_{\text{c}}$ $\approx$ 82 K) and 2H-Co${}_{0.34}$TaS${}_2$ ($T_{\text{N}}$ $\approx$ 36 K), respectively, albeit weaker for lower $x$ crystals. Co-intercalation promoted ferromagnetic to antiferromagnetic transition is further confirmed by the Hall resistivity; the sign change of the ordinary Hall coefficient indicates a multi-band behavior in 2H-Co${}_x$TaS${}_2$.

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Cited by in corpus (1)

• Optical fingerprints of the electronic band reconstruction in van der Waals magnetic materials