Satoshi Nishimoto, Stefan-Ludwig Drechsler, Roman Kuzian, Johannes Richter, Jiri Malek, Miriam Schmitt, Jeroen van den Brink, Helge Rosner
For the 1D-frustrated ferromagnetic J_1-J_2 model with interchain coupling
added, we analyze the dynamical and static structure factor S(k,omega), the
pitch angle phi of the magnetic structure, the magnetization curve of
edge-shared chain cuprates, and focus on LiCuVO4 for which neither a perturbed
spinon nor a spin wave approach can be applied. phi is found to be most
sensitive to the interplay of frustration and quantum fluctuations. For LiVCuO4
the obtained exchange parameters J are in accord with the results for a
realistic 5-band extended Hubbard model and LSDA + U predictions yielding
alpha=J_2/|J_1| about 0.75 in contrast to 5.5 > alpha > 1.42 suggested in the
literature. The alpha-regime of the empirical phi-values in NaCu2O2 and
linarite are considered, too.
View original:
http://arxiv.org/abs/1105.2810
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