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arXiv · 2205.14802

Uniaxial ferromagnetism in the kagome metal TbV${_6}$Sn${_6}$

Elliott Rosenberg·Jonathan M. DeStefano·Yucheng Guo·Ji Seop Oh·Makoto Hashimoto·Donghui Lu·Robert J. Birgeneau·Yongbin Lee·Liqin Ke·Ming Yi·Jiun-Haw Chu
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Abstract

The synthesis and characterization of the vanadium-based kagome metal TbV${_6}$Sn${_6}$ is presented. X-ray measurements confirm this material forms with the same crystal structure type as the recently investigated kagome metals GdV$_6$Sn$_6$ and YV$_6$Sn$_6$, with space group symmetry P6/mmm. A signature of a phase transition at 4.1K is observed in heat capacity, resistivity, and magnetic susceptibility measurements, and both resistivity and magnetization measurements exhibit hysteresis in magnetic field. Furthermore, a strikingly large anisotropy in the magnetic susceptibility was observed, with the c-axis susceptibility nearly 100 times the ab plane susceptibility at 2K. This is highly suggestive of uniaxial ferromagnetism, and the large size of 9.4$μ_b$/f.u. indicates the Tb$^{3+}$ $4f$ electronic moments cooperatively align perpendicular to the V kagome lattice plane. The entropy at the phase transition is nearly Rln(2), indicating that the CEF ground state of the Tb$^{3+}$ ion is a doublet, and therefore the sublattice of $4f$ electrons in this material can be shown to map at low temperatures to the Ising model in a D$_{6h}$ symmetry environment. Hall measurements at temperatures from 300K to 1.7K can be described by two-band carrier transport at temperatures below around 150K, with a large increase in both hole and electron mobilities, similar to YV$_6$Sn$_6$, and an anomalous Hall effect is seen below the ordering temperature. Angle-resolved photoemission measurements above the magnetic ordering temperature reveal typical kagome dispersions. Our study presents TbV${_6}$Sn${_6}$ as an ideal system to study the interplay between Ising ferromagnetism and non-trivial electronic states emerging from a kagome lattice.

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Elliott Rosenberg, Jonathan M. DeStefano, Yucheng Guo, Ji Seop Oh, Makoto Hashimoto, Donghui Lu, Robert J. Birgeneau, Yongbin Lee, Liqin Ke, Ming Yi, Jiun-Haw Chu. 2022-05-30. Uniaxial ferromagnetism in the kagome metal TbV${_6}$Sn${_6}$. https://doi.org/10.1103/physrevb.106.115139

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