EPR in Kagome Staircase Compound Mg2.997Co0.003V2O8

P. Aleshkevych, J. Fink-Finowicki and H. Szymczak Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

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Received: 04 09 2006;

The paramagnetic resonance of Co2+ ions in Mg2.997Co0.003V2O8 single crystals are reported. The EPR spectrum shows two groups of resonance lines associated with two crystallographically nonequivalent Co ions positions that are known in the kagome staircase system as "cross-tie" and "spine" sites. No preferential occupation of Co2+ ions in the kagome lattice was observed. The ground state was described by spin-Hamiltonian with an effective electronic spin S=1/2 and nuclear spin I=7/2. The local symmetry of oxygen octahedron surrounding Co ions, main values of the g-factors, and hyperfine structure were determined for both cobalt positions.

DOI: 10.12693/APhysPolA.111.105 PACS numbers: 76.30.Da, 76.30.Fc