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Paper detail

Anomalous High-Energy Spin Excitations in La2CuO4

Inelastic neutron scattering is used to investigate the collective magnetic excitations of the high-temperature superconductor parent antiferromagnet La2CuO4. We find that while the lower energy excitations are well described by spin-wave theory, including one- and two-magnon scattering processes, the high-energy spin waves are strongly damped near the (1/2,0) position in reciprocal space and merge into a momentum dependent continuum. This anomalous damping indicates the decay of spin waves into other excitations, possibly unbound spinon pairs.

preprint2010arXivOpen access
N. S. HeadingsS. M. HaydenR. ColdeaT. G. Perring
cond-mat.supr-concond-mat.str-el
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N. S. HeadingsS. M. HaydenR. ColdeaT. G. Perring

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