Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-12-22
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, accepted for publication in Phys. Rev. Letters
Scientific paper
10.1103/PhysRevLett.96.027209
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.
Deisenhofer Joachim
Eremin M. V.
Eremina R. M.
Horn Siegfried
Loidl Alois
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