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A2CuBʹO6 double perovskites with A = Sr and Ba and Bʹ = W, Te, and Mo have received a lot of attention in the literature as material candidates for the spin-liquid ground state and frustrated spin lattices. However, Ca analogues have not been reported yet. In this work, the Ca2CuWO6 double perovskite was synthesized by a high-pressure, high-temperature method at 6 GPa and between 1370 and 2020 K. The crystal structure was studied by synchrotron powder X-ray diffraction between 100 K and 1000 K. Ca2CuWO6 crystallizes in the triclinic space group P-1 between 100 K and 1000 K with the onset of partial decomposition above 750 K. Room-temperature lattice parameters are a = 5.68435 Å, b = 7.51261 Å, c = 5.49548 Å, a = 90.0703, b = 94.7634, and g = 90.2311. Ca2CuWO6 demonstrates low-dimensional magnetic properties with the broad maximum of the magnetic susceptibility around 60 K caused by the dominant second-neighbor interactions within the deformed square planes of the Cu2+ ions. A long-range antiferromagnetic order takes place at TN = 32 K. A magnetic field-induced transition was observed at 28 kOe (at 2 K and 5 K), 29 kOe (at 10 K), 30 kOe (at 15 K), 32 kOe (at 20 K), and 36 kOe (at 25 K). Solid solutions Ca2-xSrxCuWO6 with x = 0.5, 1, and 1.5 were also prepared. The x = 0.5 and 1 samples crystallize in the space group P-1 at room temperature, while the x = 1.5 sample has monoclinic symmetry (space group P21/n). They also show low-dimensional magnetic behavior, TN = 32–34 K, and magnetic field-induced transitions.

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• In Copyright
  ©2025 American Physical Society

Keyword: double perovskites, magnetic properties, synchrotron diffraction, low-dimensional magnetism, first-principles calculations

Date published: 2025-03-24

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 1550235X) vol. 111 issue. 9 094432

Funding:

• Japan Society for the Promotion of Science JP22H04601
• Ministry of Education, Culture, Sports, Science and Technology
• Japan Synchrotron Radiation Research Institute 2023B1676

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5864

First published URL: https://doi.org/10.1103/physrevb.111.094432

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Updated at: 2025-11-08 08:30:15 +0900

Published on MDR: 2025-11-08 08:21:15 +0900