Resonant magnetic excitations at high energy in superconducting \bf YBa₂Cu₃O_6.85

2004/03/24 by S. Pailhes, Y. Sidis, P. Bourges +5
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.93.167001

published as Phys. Rev. Lett, 93, 167001 (2004). · 5 figures

arxiv created 2004/03/24 · arxiv updated 2009/12/01

Abstract

A detailed inelastic neutron scattering study of the high temperature superconductor \rm YBa₂Cu₃O_6.85 provides evidence of new resonant magnetic features, in addition to the well known resonant mode at 41 meV: (i) a commensurate magnetic resonance peak at 53 meV with an even symmetry under exchange of two adjacent \rm CuO₂ layers; and (ii) high energy incommensurate resonant spin excitations whose spectral weight is around 54 meV. The locus and the spectral weight of these modes can be understood by considering the momentum shape of the electron-hole spin-flip continuum of d-wave superconductors. This provides new insight into the interplay between collective spin excitations and the continuum of electron-hole excitations.

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