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EPR in kagome staircase compound Mg2.997Co0.003V2O8

Pavlo Aleshkevych ,  Jan Fink-Finowicki ,  Henryk Szymczak 

Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland


The paramagnetic resonance studies of Co2+ ions in Mg2.997Co0.003V2O8 single crystals are reported. The single crystals of Mg2.997Co0.003V2O8 were grown from polycrystalline feed rods by floating zone technique. This compound have the same (Cmca) crystal structure and very similar lattice parameters to the kagome staircase compound Co3V2O8. The EPR measurements were carried out using Bruker EMX spectrometer working on fixed frequency (9.25 GHz) with Oxford-made helium flowing cryostat in temperature range from 3.8K to 300K. The samples were the roentgenographically oriented disks of 3 mm diameter and thickness of 0.5 mm cut from the single crystalline rod. 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. 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.


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Presentation: Poster at E-MRS Fall Meeting 2006, Symposium K, by Pavlo Aleshkevych
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 08:55
Revised:   2009-06-07 00:44