Experimental confirmation of the magnetic ordering transition induced by an electronic structure change in the metallic triangular antiferromagnet Co_1/3TaS₂

2025/11/06 by Noh, Han-Jin, Cho, En-Jin, Park, Byeong-Gyu +6
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2511.03999

Abstract

We report ARPES studies combined with DFT+DMFT calculations to confirm that the magnetic ordering vector transition from Q=(1/2,0,0) to Q=(1/3,0,0) in the metallic triangular antiferromagnets Co_1/3±εTaS₂ (ε≈0.007) is induced by the electronic structure change in the system. The ARPES-measured Fermi surface (FS) maps of Co_0.325TaS₂ show two hexagonal and one circular hole-like FSs around Γ, which matches well with the triple-Q state by taking into account the contribution of nesting vectors occurring between Co 3d and Ta 5d orbitals. In the case of Co_0.340TaS₂, a new electron pocket around K appears and the FS geometry changes as a result of the correlation effect of Co₄S₁₈ tripods forming in the system. The magnetic susceptibility calculations based on the DFT+DMFT band structure indicate that the most stable magnetic ordering vector changes to (1/3,0,0) from (1/2,0,0), which is very consistent with the magnetic phase transition around x=1/3 in Co_xTaS₂.

Citations

• Electrical control of topological 3Q state in intercalated van der Waals antiferromagnet Cox-TaS2
• DFT+DMFT study of the magnetic susceptibility and the correlated electronic structure in transition-metal intercalated NbS₂

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