Composition dependence of bulk properties in the Co-intercalated transition-metal dichalcogenide Co${}_{1/3}$TaS${}_2$

Abstract

Spontaneous Hall conductivity has recently been reported in the triangular lattice antiferromagnet Co${}_{1/3}$TaS${}_2$ under a zero magnetic field. This phenomenon originates from the distinctive noncoplanar triple-Q magnetic ground state, possessing uniform real-space Berry curvature characterized by scalar spin chirality. We investigated the physical properties of Co${}_{1/3}$TaS${}_2$ by judiciously controlling the composition, revealing a drastic change in its bulk properties, even by slight variations in cobalt composition, despite the same crystal structure. For $0.299<x<0.325$, Co${}_x$TaS${}_2$ keeps all the characteristics of the ground state consistent with the previous studies -- two antiferromagnetic phase transitions at $T_{N1}$ and $T_{N2}(<T_{N1})$, a large spontaneous Hall conductivity (${\sigma }_{xy}(H=0)$), and a weak ferromagnetic moment along the c-axis. However, samples with $x>0.330$ exhibit distinct bulk properties, including the absence of both ${\sigma }_{xy}(H=0)$ and the weak ferromagnetic moment. Our neutron diffraction data reveal that Co${}_x$TaS${}_2$ with $x>0.330$ develops coplanar helical magnetic order with $q_{m1}=(1/3,0,0)$. This is entirely different from what has been seen in $x<0.325$, explaining the observed composition dependence.

15 pages, 4 figures, accepted for publication in Phys. Rev. B

References in corpus (5)

• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Suppression of magnetic ordering in XXZ-type antiferromagnetic monolayer NiPS3
• Scalar spin chirality and quantum Hall effect on a triangular lattice
• Field-tunable toroidal moment and anomalous Hall effect in noncollinear antiferromagnetic Weyl semimetal Co1/3TaS2
• Spin texture induced by non-magnetic doping and spin dynamics in 2D triangular lattice antiferromagnet h-Y(Mn,Al)O3

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• Persistent spin textures, altermagnetism and charge-to-spin conversion in metallic chiral crystals TM${}_3$X${}_6$
• Tunable chiral and nematic states in the triple-Q antiferromagnet Co${}_{1/3}$TaS${}_2$
• Coexistence of Commensurate and Incommensurate Antiferromagnetic Groundstates in Co${}_x$NbSe${}_2$ Single Crystal
• Spin-Valley Locking in 2H-TaS2 and Its Co-Intercalated Counterpart: Roles of Surface Domains and Co Intercalation
• Correlation-driven origin of shallow electron pocket in Co${}_{1/3}$TaS${}_2$ revealed by ARPES and cluster perturbation theory
• Discovery of Van Hove Singularities: Electronic Fingerprints of 3Q Magnetic Order in a van der Waals Quantum Magnet
• Plasmon Engineering in Intercalated 2H-TaS${}_2$