Abstract
The electron paramagnetic resonance (EPR) of Mn 2+ in geometrically frustrated Mg 2.97Mn 0.03V 2O 8 single crystals is reported. The complex EPR spectrum shows resonance lines associated with two crystallographically nonequivalent lattice positions of Mn ions that are known in the kagomé staircase system as “cross-tie” and “spine” sites. Additionally, strongly anisotropic resonances of various Mn 2+–Mn 2+ pairs are observed. The signs and values of the crystal field parameters are determined from EPR spectra. The local magnetic symmetry details of magnetic ions and components of the hyperfine structure tensor are determined for various nonequivalent manganese positions. The exchange coupling between Mn ions in “cross-tie” and “spine” sites is found to be J = 41 K.
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