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Title: Antiferromagnetic order of ferromagnetically coupled dimers in the double pyrovanadate CaCoV2O7
Authors: Murasaki, R
Nawa, K
Okuyama, D
Avdeev, M
Sato, TJ
Keywords: Magnetic properties
Neutron diffraction
Transition elements
Issue Date: 2-Aug-2021
Publisher: Cornell University
Citation: Murasaki, R., Nawa, K., Okuyama, D., Avdeev, M., & Sato, T. (2021). Antiferromagnetic order of ferromagnetically coupled dimers in the double pyrovanadate CaCoV2O7. arXiv preprint arXiv:2108.00715.
Abstract: Magnetic properties of the pyrovanadate CaCoV2O7 have been studied by means of the bulk magnetization and neutron powder diffraction measurements. Magnetic susceptibility in the paramagnetic phase shows Curie-Weiss behavior with negative Weiss temperature ≃ −22.5 K, indicating dominant antiferromagnetic interactions. At TN = 3.44 K, CaCoV2O7 shows antiferromagnetic order, accompanied by a weak net ferromagnetic moment of ∼ 0.05 μB/Co2+. Neutron powder diffraction confirms the formation of antiferromagnetic order below TN. It was further confirmed from the magnetic structure determination that the two Co2+ ions in the adjacent edge-sharing octahedra have almost parallel (ferromagnetic) spin arrangement, indicative of a formation of a ferromagnetic spin dimer. The antiferromagnetic order is, in turn, stabilized by sizable inter-dimer antiferromagnetic interactions.
Description: This is a preprint. Preprints and early-stage research may not have been peer reviewed yet.
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