Highly Dispersive Spin Excitations in the Chain Cuprate Li2CuO2

Details Highly Dispersive Spin Excitations in the Chain Cuprate Li2CuO2 Highly Dispersive Spin Excitations in the Chain Cuprate Li2CuO2

2009-09-30

arxiv.org/abs/0909.5687v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, submitted to Europhys. Lett

Scientific paper

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.

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