[PC4] Novel materials

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[PC4-03] Pressure-Driven Electronic Reconstruction and Anisotropy modulation in Kagome metals RV₆Sn₆ (R = Rare earth elements)

*Rui Zhang¹, Jianfeng Li¹, Pingxiang Zhang¹, Xianghong Liu¹, Xiaofan Yang¹ (1. Northwest institute for non-ferrous metal research (China))

Keywords:

High-pressure,Kagome lattice,Band structure reconstruction,Anisotropy modulation,Charge distribution,Superconductivity

Kagome-lattice materials, with their inherent geometrical frustration and unique electronic structures, provide an ideal platform for realizing exotic quantum phenomena, such as high-temperature superconductivity, fractional quantum Hall effects, and Wigner crystal states. Among them, the newly found V-based Kagome superconductors, exemplified by AV₃Sb₅ (A = Cs, Rb, and K) are known for exhibiting complex phase diagrams with hydrostatic pressure modulation. In this work, we investigate another novel V-Kagome metal, RV₆Sn₆ (R = rare earth), focusing on single crystals of GdV₆Sn₆ or TbV₆Sn₆. High-pressure transport measurements reveal a characteristic turning point in the magnetic transition temperature at a critical pressure P_c (< 5 GPa), accompanied by a sign reversal in the anomalous Hall effect. This is dominated by the intrinsic Berry-curvature-driven mechanism confirmed by the Tian–Ye–Jin scaling model, while the pressure modulates the relative contributions of intrinsic and extrinsic channels. Notably, no crystallographic phase transition is observed up to the highest measured pressures, apart from a gradual lattice contraction. Density functional theory calculations further reveal the pressure-driven evolution of the electronic structure. The results show that up to 60 GPa, the band topology remains robust and no emergent phase appears. However, at ~107 GPa, a Lifshitz transition occurs, marked by a newly-formed van Hove singularity crossing the Fermi level. This band reconstruction gives rise to a substantial enhancement of the density of states, potentially strengthens electron–phonon coupling, and promotes the formation of interlayer charge channels, suggesting favorable conditions for pressure-induced superconductivity. Our combined experimental and theoretical study elucidates the connection between pressure-driven electronic reconstruction and magnetic transport anomalies in RV₆Sn₆, highlighting their potential as a versatile platform for exploring pressure-tuned superconductivity and topological states in Kagome quantum materials.