Volume 98, Number 3, May 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 May 2012|
The strength of frustration and quantum fluctuations in LiVCuO4
Institute for Theoretical Solid State Physics, IFW-Dresden - Helmholtzstrasse 20, 01069 Dresden, Germany, EU
2 Donostia International Physics Center (DIPC) - ES-20018 Donostia-San Sebastian, Spain, EU
3 Institut für Theoretische Physik, Universität Magdeburg - Magdeburg, Germany, EU
4 Institute of Physics, ASCR - Prague, Czech Republic, EU
5 Max-Planck-Institut für Chemische Physik fester Stoffe - Dresden, Germany, EU
Accepted: 17 April 2012
For the 1D-frustrated ferromagnetic J1-J2 model with inter-chain coupling added, we analyze the dynamical and static spin structure factor S(k, ω), the pitch angle φ of the magnetic structure, the magnetization curve of edge-shared chain cuprates, and focus on LiCuVO4=LiCuVO4 for which neither a perturbed spinon nor a spin wave approach can be applied. φ is found to be most sensitive to the interplay of frustration and quantum fluctuations. For LiCuVO4 the obtained J's agree with the results for a realistic 5-band extended Hubbard model and LSDA+U predictions yielding α=J2/|J1|≈0.75 in contrast to 5.5>α>1.42 suggested in the literature. The α-regime of the empirical φ-values in NaCu2O2 and linarite are considered, too.
PACS: 74.72.-h – Cuprate superconductors / 78.70.Nx – Neutron inelastic scattering / 75.30.Ds – Spin waves
© EPLA, 2012
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