Abstract
Inelastic neutron scattering experiments have been carried out on a Nd 2CuO 4 single crystal to investigate the magnetic excitations spectrum arising from the Cu 2+ spins. The fluctuations of the out-of-plane spin component exhibit an anisotropy gap of about 5.5 meV. The fluctuations of the in-plane spin component seem to present also a gap which is only sizeable in phase II.
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