Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa2Cu3O6.95
D. Reznik, P. Bourges, L. Pintschovius, Y. Endoh, Y. Sidis, T. Matsui, S. Tajima
Abstract
Detailed neutron scattering measurements of YBa2Cu3O6.95 found that the resonance peak and incommensurate magnetic scattering induced by superconductivity represent the same physical phenomenon: two dispersive branches that converge near 41 meV and the in-plane wave-vector qaf=(pi/a, pi/a) to form the resonance peak. One branch has a circular symmetry around qaf and quadratic downward dispersion from ~41 meV to the spin gap of 33+-1meV. The other, of lower intensity, disperses from ~41 meV to at least 55 meV. Our results exclude a quartet of vertical incommensurate rods in q-w space expected from spin waves produced by dynamical charge stripes as an origin of the observed incommensurate scattering in optimally-doped YBCO.
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