The strength of frustration and quantum fluctuations in LiVCuO4

Abstract

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.

7 pages, 7 figures, (1 figure added), improved text including also the abstract (the present second version has been submitted to EPL 26.10.2011, so far with one missing first referee report)

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• Thermodynamic Properties of the Anisotropic Frustrated Spin-chain Compound Linarite PbCuSO${}_4$(OH)${}_2$
• Complex field-induced states in Linarite PbCuSO${}_4$(OH)${}_2$ with a variety of high-order exotic SDW${}_p$ states
• Ca2Y2Cu5O10: the first frustrated quasi-1D ferromagnet close to criticality
• Magnetism of CuX2 frustrated chains (X = F, Cl, Br): the role of covalency
• Chirality-driven ferroelectricity in LiCuVO${}_4$
• Consequences of critical interchain couplings and anisotropy on a Haldane chain
• The dynamics of linarite: Observations of magnetic excitations
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• Highly dispersive magnons with spin-gap like features in the frustrated ferromagnetic S=1/2 chain compound Ca2Y2Cu5O10 detected by inelastic neutron scattering
• Magnetic excitations in quasi-one dimensional helimagnets: Magnon decays and in uence of the inter-chain interactions
• Dynamics of Bound Magnon Pairs in the Quasi-One-Dimensional Frustrated Magnet LiCuVO_4
• Low-energy spin excitations of the frustrated ferromagnetic $J_1$-$J_2$ chain material linarite, PbCuSO${}_4$(OH)${}_2$, in applied magnetic fields $\mathbf{H}\parallel b$ axis
• Dynamical structure factors in the nematic phase of frustrated ferromagnetic spin chains
• Large magnetic thermal conductivity induced by frustration in low-dimensional quantum magnets
• Anomalous fractional quantization in the kagomelike Heisenberg ladder: Emergence of the effective spin-1 chain
• Self-organised magnon condensation in quasi-1D edge-shared cuprates without external fields
• Dynamics of the multiferroic LiCuVO4 influenced by electric field