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arxiv: 1009.2915 · v1 · pith:3TKVB2MBnew · submitted 2010-09-15 · ❄️ cond-mat.str-el · cond-mat.supr-con

Anomalous High-Energy Spin Excitations in La2CuO4

N. S. Headings , S. M. Hayden , R. Coldea , T. G. Perring This is my paper
classification ❄️ cond-mat.str-el cond-mat.supr-con
keywords excitationsspinanomaloushigh-energyla2cuo4scatteringwavesantiferromagnet
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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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