arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.13432cond-mat.str-el
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范德华磁体2 H-M $_x$ TaS $_2$(M = Mn,Co)的电和热输运

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

Yu Liu, Zhixiang Hu, Xiao Tong, Eric D. Bauer, C. Petrovic

摘要:

本文详细研究了M原子嵌入范德华能隙的2 H-M $_x$ TaS $_2$(M = Mn,Co)磁体的电输运和热输运性质。在2 H-Co $_{0.22}$ TaS $_2$中引入了强单轴各向异性的铁磁性,而在2 H-Mn $_x$ TaS $_2$中引入了强单轴各向异性的铁磁性,并最终在2 H-Co $_{0.34}$ TaS $_2$中引入了三维反铁磁性.随温度变化的电阻率显示所有样品的金属行为。2 H-Co $_x$ TaS $_2$的热电势在整个温度范围内均为负值,而2 H-Mn $_x$ TaS $_2$的热电势随Mn的增加由负变正。扩散热电响应占主导地位,在高温和低温范围内的所有样品。在2 H-Mn $_{0.28}$ TaS $_2$($T_\textrm{c}$ $\approx$ 82 K)和2 H-Co $_{0.34}$ TaS $_2$($T_\textrm{N}$ $\approx$ 36 K)的磁转变处分别观察到电阻率的明显扭结、热导率的弱异常以及热电势的斜率变化,尽管较低的$x$晶体较弱。霍尔电阻进一步证实了Co的嵌入促进了铁磁到反铁磁的转变,普通霍尔系数的符号变化表明了2 H-Co $_x$ TaS $_2$的多带行为.

英文摘要:

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$_2$ ($T_\textrm{c}$ $\approx$ 82 K) and 2H-Co$_{0.34}$TaS$_2$ ($T_\textrm{N}$ $\approx$ 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$_2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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