Abstract
A synthetic analog of rare secondary mineral namibite Cu(BiO)2VO4OH has been obtained by the hydrothermal method. The crystal structure of this compound contains isolated uniform chains of vertex-connected copper–oxygen octahedra. Magnetic susceptibility (χ) and magnetization (M) measurements have not indicated the long-range order in the temperature interval 2–300 K. Specific heat (Cp) measurements suggest the formation of a spin-liquid state at low temperatures. X-band electron paramagnetic resonance data recorded at low temperatures have demonstrated only a signal from impurities. First-principles calculations have estimated the exchange interaction in the chains as J = 555 K, whereas exchange interactions between the chains turn out to be one to two orders of magnitude smaller. Thus, namibite represents a rare example of an unordered half-integer spin chain.
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ACKNOWLEDGMENTS
X-ray experiments were conducted using the facility of the Collective Use Center at the Federal Research Center “Crystallography and Photonics,” Russian Academy of sciences.
Funding
This study was supported by the Russian Science Foundation (project no. 22-22-00023) and the Ministry of Science and Higher Education.
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Translated by V. Isaakyan
This article is prepared for the memorial issue of the journal dedicated to the 95th birthday of L.A. Prozorova.
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Shvanskaya, L.V., Bushneva, T.D., Ivanova, A.G. et al. Low-Dimensional Magnetism in Namibite Cu(BiO)2VO4OH. J. Exp. Theor. Phys. 137, 520–525 (2023). https://doi.org/10.1134/S1063776123100114
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DOI: https://doi.org/10.1134/S1063776123100114