A pseudogap term in the magnetic response of the cuprate superconductors...

We combine neutron scattering (INS) data and NMR/NQR nuclear spin lattice relaxation rate
(1/T1) data to deduce the existence of a new contribution to the magnetic response χ′′(~q, ω) in
cuprate superconductors. This contribution, which has yet to be observed with INS, is shown to
embody the magnetic pseudogap effects. As such, it explains the long-standing puzzle of pseudogap
effects missing from cuprate INS data, dominated by stripe fluctuations, for χ′′(~q, ω) at low energies. For La1.86Sr0.14CuO4 and Y Ba2Cu3O6.5, the new term is the chief contributor to 1/T1 for T ≫ Tc.