The strength of frustration and quantum fluctuations in LiVCuO4

Details The strength of frustration and quantum fluctuations in LiVCuO4 The strength of frustration and quantum fluctuations in LiVCuO4

2011-05-13

arxiv.org/abs/1105.2810v2

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures, (1 figure added), improved text including also the abstract (the present second version has been submitted

Scientific paper

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.

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