Anomalous High-Energy Spin Excitations in La2CuO4

Details Anomalous High-Energy Spin Excitations in La2CuO4 Anomalous High-Energy Spin Excitations in La2CuO4

2010-09-15

arxiv.org/abs/1009.2915v1

Phys. Rev. Lett. 105, 247001 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.105.247001

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.

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