Itinerant A-type Antiferromagnetic Order in CoTaSe
arXiv:2408.10421 · doi:10.1103/PhysRevB.110.144420
Abstract
We present the magnetic behavior and resulting transport properties of TaSe when intercalated by magnetically active cobalt cations. Acting as the layered host, TaSe is a transition metal dichalcogenide (TMD) that adopts the 2H-polytype. We find through our single crystal and powder diffraction studies that we can prepare the stoichiometry CoTaSe, which crystallizes in the centrosymmetric space group . From magnetic susceptibility and x-ray photoelectron spectroscopy measurements, we find a transition consistent with antiferromagnetic order below the temperature = 173 K and Co in the high-spin state. Neutron powder diffraction and specific heat measurements, however, point to a much smaller than anticipated ordered moment in this sample. From the neutron results, the magnetic structure can be described as an A-type antiferromagnet with an ordered moment size of 1.35(11) per Co cation. The direction of the moments are all long the c-axis, which is consistent with the magnetization and susceptibility studies showing this direction to be the easy axis. Interestingly, we find that a weak and subtle ferromagnetic component appears to exist along the -plane of the CoTaSe crystals. We place the results of this work in the context of other magnetic-ion intercalated TMDs, especially those of Ta and Nb.
13 pages, 8 figures
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