Spin waves and electronic interactions in La2CuO4

Details Spin waves and electronic interactions in La2CuO4 Spin waves and electronic interactions in La2CuO4

2000-06-23

arxiv.org/abs/cond-mat/0006384v3

Phys. Rev. Lett. 86, 5377 (2001).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages revtex, 3 ps figures (fig(1) color), updated figures 2&3 and added analysis details to include referees' comments

Scientific paper

10.1103/PhysRevLett.86.5377

The magnetic excitations of the square-lattice spin-1/2 antiferromagnet and high-Tc parent La2CuO4 are determined using high-resolution inelastic neutron scattering. Sharp spin waves with absolute intensities in agreement with theory including quantum corrections are found throughout the Brillouin zone. The observed dispersion relation shows evidence for substantial interactions beyond the nearest-neighbor Heisenberg term, which can be understood in terms of a cyclic or ring exchange due to the strong hybridization path around the Cu4O4 square plaquettes.

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