Magnetic neutron scattering resonance of high-T-c superconductors in external magnetic fields: An SO(5) study
The magnetic resonance at 41 meV observed in neutron scattering studies of YBa2Cu3O7 holds a key position in the understanding of high-T-c, superconductivity. Within the SO(5) model for superconductivity and antiferromagnetism, we have calculated the effect of an applied magnetic field on the neutron scattering cross section of the magnetic resonance. In the presence of Abrikosov vortices, the neutron scattering cross section shows clear signatures of not only the fluctuations in the superconducting order parameter psi, but also the modulation of the phase of psi due to vortices. In reciprocal space we find that (i) the scattering amplitude is zero at (pi/a,pi/a), (ii) the resonance peak is split into a ring with radius pi/d centered at (pi/a, pi/a), d being the vortex lattice constant, and consequently, (iii) the splitting pi/d scales with the magnetic field as root B.
Tech Univ Denmark, Mikroelekt Ctr, DK-2800 Lyngby, Denmark. Riso Natl Lab, Condensed Matter Phys & Chem Dept, DK-4000 Roskilde, Denmark. Niels Bohr Inst, Orsted Lab, DK-2100 Copenhagen, Denmark. Mortensen, NA, Tech Univ Denmark, Mikroelekt Ctr, Orsteds Plads,Blgd 345 E, DK-2800 Lyngby, Denmark.
Record created on 2007-01-24, modified on 2016-08-08