Unconventional anisotropic superexchange in NaV2O5

Abstract

The strong line broadening observed in electron spin resonance on NaV${}_2$O${}_5$ is found to originate from an unusual type of the symmetric anisotropic exchange interaction with simultaneous spin-orbit coupling on both sites. The microscopically derived anisotropic exchange constant is almost two orders of magnitude larger than the one obtained from conventional estimations. Based on this result we systematically evaluate the anisotropy of the ESR linewidth in terms of the symmetric anisotropic exchange, only, and we find microscopic evidence for precursor effects of the charge ordering already below 150 K.

4 pages, 4 figures, accepted for publication in Phys. Rev. Letters

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Cited by in corpus (7)

• Structural and magnetic dimers in the spin-gapped system CuTe2O5
• Electron spin resonance in S=1/2 antiferromagnets at high temperature
• Spin dynamics in the low-dimensional magnet TiOCl
• Dynamical Dzyaloshinsky-Moriya Interaction in KCuF3
• Electron Spin Resonance across the Charge-ordering Transition in YBaMn2O6
• Coexisting spinons and magnons in frustrated zigzag spin-1/2 chain compound $\beta$-TeVO${}_4$
• Exchange anisotropy as mechanism for spin-stripe formation in frustrated spin chains