Magnetic coherence as a universal feature of cuprate superconductors

Abstract

We extend our previous work on the magnetic coherence effect in La2−xSrxCuO4 in which it was shown that the effect arises from the interplay of an incommensurate magnetic response, the form of the underlying Fermi surface, and the opening of the d-wave gap in the fermionic spectrum. We present predictions for the magnetic coherence effect in parts of the magnetic Brillouin zone so far unexplored by inelastic neutron scattering (INS) experiments including parts where the so-called spin gap vanishes. We calculate the magnetic coherence effect expected in the superconducting state of YBa2Cu3O6+x, and make detailed predictions for its frequency and momentum dependence. To the extent that our predictions are confirmed by future experiments, our work will demonstrate that INS experiments are not confined to providing information on the magnetic excitation spectrum, but can also probe the electronic spectrum in the superconducting state.

Source-reported materials — not catalogue approval

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