Highly Dispersive Spin Excitations in the Chain Cuprate Li2CuO2

Abstract

We present an inelastic neutron scattering investigation of Li2CuO2 detecting the long sought quasi-1D magnetic excitations with a large dispersion along the CuO2-chains studied up to 25 meV. The total dispersion is governed by a surprisingly large ferromagnetic (FM) nearest-neighbor exchange integral J1=-228 K. An anomalous quartic dispersion near the zone center and a pronounced minimum near (0,0.11,0.5) r.l.u. (corresponding to a spiral excitation with a pitch angle about 41 degree point to the vicinity of a 3D FM-spiral critical point. The leading exchange couplings are obtained applying standard linear spin-wave theory. The 2nd neighbor inter-chain interaction suppresses a spiral state and drives the FM in-chain ordering below the Ne'el temperature. The obtained exchange parameters are in agreement with the results for a realistic five-band extended Hubbard Cu 3d O 2p model and L(S)DA+U predictions.

6 pages, 4 figures, submitted to Europhys. Lett

References in corpus (6)

• The magnetic structure of Li2CuO2: from ab initio calculations to macroscopic simulations
• On the absence of a spiral magnetic order in Li2CuO2 with one-dimensional CuO2 ribbon chains
• Weakly anisotropic frustrated zigzag spin chain
• Exact one- and two-particle excitation spectra of acute-angle helimagnets above their saturation magnetic field
• Temperature dependent optical conductivity of undoped cuprates with weak exchange
• Single-crystal growth and dependences on the hole concentration and magnetic field of the magnetic ground state in the edge-sharing CuO${}_2$ chain system Ca${}_{2+x}$Y${}_{2-x}$Cu${}_5$O${}_{10}$

Cited by in corpus (34)

• beta-Cu2V2O7: a spin-1/2 honeycomb lattice system
• Quantum spin liquid in frustrated one dimensional LiCuSbO4
• Quantum Magnetism in Minerals
• Magnetic properties and revisited exchange integrals of the frustrated chain cuprate PbCuSO${}_4$(OH)${}_2$ - linarite
• Electron-lattice interactions strongly renormalize the charge transfer energy in the spin-chain cuprate Li${}_2$CuO${}_2$
• Bridging frustrated-spin-chain and spin-ladder physics: quasi-one-dimensional magnetism of BiCu2PO6
• Determining the Short-Range Spin Correlations in Cuprate Chain Materials with Resonant Inelastic X-ray Scattering
• Thermodynamic Properties of the Anisotropic Frustrated Spin-chain Compound Linarite PbCuSO${}_4$(OH)${}_2$
• Quantum spin chains with frustration due to Dzyaloshinskii-Moriya interactions
• Saturation field of frustrated chain cuprates: broad regions of predominant interchain coupling
• Complex field-induced states in Linarite PbCuSO${}_4$(OH)${}_2$ with a variety of high-order exotic SDW${}_p$ states
• Large quantum fluctuations in the strongly coupled spin-1/2 chains of green dioptase: a hidden message from birds and trees
• The strength of frustration and quantum fluctuations in LiVCuO4
• Static and Dynamic Magnetic Response of Fragmented Haldane-like Spin Chains in Layered Li3Cu2SbO6
• Ca2Y2Cu5O10: the first frustrated quasi-1D ferromagnet close to criticality
• Interplay of Magnetic Exchange Interactions and Ni-S-Ni Bond Angles in Polynuclear Nickel(II) Complexes
• Thermodynamics of the one-dimensional frustrated Heisenberg ferromagnet with arbitrary spin
• The dynamics of linarite: Observations of magnetic excitations
• Uniform spin chain physics arising from NCN bridges in CuNCN: surprises on the way from copper oxides to their nitride analogs
• Nearly compensated exchange in the dimer compound callaghanite Cu${}_2$Mg${}_2$(CO${}_3$)(OH)${}_6$$\cdot$2H${}_2$O
• Probing inter- and intrachain Zhang-Rice excitons in Li${}_2$CuO${}_2$ and determining their binding energy
• Orthogonal spin arrangement as possible ground state of three - dimensional Shastry - Sutherland network in Ba3Cu3In4O12
• Dominant ferromagnetism in the spin-1/2 half-twist ladder 334 compounds, Ba3Cu3In4O12 and Ba3Cu3Sc4O12
• Highly dispersive magnons with spin-gap like features in the frustrated ferromagnetic S=1/2 chain compound Ca2Y2Cu5O10 detected by inelastic neutron scattering
• Electronic structure of KTi(SO4)2.H2O - a S=1/2 frustrated chain antiferromagnet
• The origin of up-up-down-down magnetic order in Cu${}_2$GeO${}_4$
• Comment on `Oxygen vacancy-induced magnetic moment in edge-sharing CuO${}_2$ chains of Li${}_2$CuO${}_2$'
• Roles of easy-plane and easy-axis XXZ anisotropy and bond alternation on a frustrated ferromagnetic spin-$1/2$ chain
• Ab initio ligand field approach to determine electronic multiplet properties
• Refined Spin Wave Model and Multi-magnon Bound States in $L{i}_{2}Cu{O}_2$
• Spin dynamics of edge-sharing spin chains in SrCa13Cu24O41
• Proximate Tomonaga-Luttinger liquid in a spin-1/2 ferromagnetic XXZ chain compound
• Self-organised magnon condensation in quasi-1D edge-shared cuprates without external fields
• Magnetic and thermodynamic studies on the distorted kagome magnet Pr${}_3$BWO${}_9$