Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95

Details Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95 Dispersion of Magnetic Excitations in Superconducting Optimally Doped YBa_2Cu_3O_6.95

2003-07-23

arxiv.org/abs/cond-mat/0307591v3

Phys. Rev. Lett., 93, 207003 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

Version 3: Author change. Changes made throughout the text and minor changes in figures, Model parameters slightly changed aft

Scientific paper

10.1103/PhysRevLett.93.207003

Detailed neutron scattering measurements of YBa_2Cu_3O_6.95 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 q_af=(pi/a, pi/a) to form the resonance peak. One branch has a circular symmetry around q_af 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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