Abstract
Magnetic properties of the antiferromagnet ZnxCu2-xV2O7 (ZnCVO) with x≈0.06 have been thoroughly investigated on powder and single-crystal samples. The crystal structure determination using powder x-ray and neutron diffraction confirms that our ZnCVO samples are isostructural with β-Cu2V2O7 (β-CVO) with a small deviation in the lattice parameters. Macroscopic magnetic property measurements also confirm the similarity between the two compounds. The Cu2+ spins were found to align along the crystallographic c axis, antiparallel to their nearest neighbors connected by the leading exchange interaction J1. Spin dynamics reveals a typical symmetric spin-wave dispersion with strong interactions in the bc plane and weak interplane coupling. The exchange interaction analysis indicates that the spin network of ZnCVO is topologically consistent with the previous DFT prediction but the values of leading exchange interactions are contradictory. Furthermore, rather than the predicted 2D honeycomb structure, the spin network in ZnCVO could be better described by the anisotropic 2D spin network composed of J1, J5, and J6 interactions, four bonds per one spin site, coupled by weak interplane interactions.
| Original language | English |
|---|---|
| Article number | 214438 |
| Journal | Physical Review B |
| Volume | 106 |
| Issue number | 21 |
| DOIs | |
| State | Published - Dec 1 2022 |
Funding
G.G. would like to thank P. Limsuwan for his useful discussions. This work (Grant No. RGNS 63-203) was supported by the Office of the Permanent Secretary, Ministry of Higher Education, Science, Research and Innovation (OPS MHESI), Thailand Science Research and Innovation (TSRI), and Phranakhon Rajabhat University. Work at Mahidol University was supported by the Thailand Center of Excellence in Physics and the National Research Council of Thailand (Grant No. N41A640158). P. S. was supported by the RGJ-PhD scholarship (Grant No. PHD/0114/2557) from Thailand Research Fund. We acknowledge the support of the National Institute of Standards and Technology, U.S. Department of Commerce, in providing the neutron research facilities used in this work. The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science user facility operated by the Oak Ridge National Laboratory.