Publications associated with Quantum Magnetism and Quantum Phase Transitions

Anomalous high-energy spin excitations in the high-Tc superconductor-parent antiferromagnet La₂CuO₄.

Phys Rev Lett 105 (2010) 247001-

NS Headings, SM Hayden, R Coldea, TG Perring

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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