Publications associated with Quantum Magnetism and Quantum Phase Transitions

Spin excitations and exchange couplings in the cuprate antiferromagnet La<inf>2</inf>CuO<inf>4</inf>

Physica B: Condensed Matter 276-278 (2000) 592-593

R Coldea, SM Hayden, G Aeppli, TG Perring, CD Frost, TE Mason, SW Cheong, Z Fisk

The spin excitations in La 2 CuO 4 , a two-dimensional spin- 1/2 Heisenberg antiferromagnet and parent compound of high-T c superconductors, have been measured throughout the Brillouin zone using high-resolution inelastic neutron scattering. The observed dispersion relations show evidence for substantial second- or third-nearest-neighbour exchange couplings in addition to the strong first nearest-neighbour antiferromagnetic exchange.

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