Magnetic Vortices in High Temperature Superconductors
Hedegard, Per
Original · EN
It is suggested that modes, observed in recent neutron scattering experiments by Lake et al., on La₂₋ₓSrₓCuO₄ in strong magnetic fields (≈ 7 T), are due to the existence of antiferromagnetic moments associated with the cores of vortices generated by the field. These moments form one-dimensional chains along the c-axis (the vortex axis), which at finite temperatures are disordered. At temperatures higher than 10 K the correlation length gets shorter than the lattice parameter, resulting in no scattering from coherent spin-waves above that temperature. The bandwidth of the spin-waves is estimated to be ≈ 4 meV in accordance with the observations.
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