A pseudogap term in the magnetic response of the cuprate superconductors

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

2011-01-27

arxiv.org/abs/1101.5360v1

Physics

Condensed Matter

Superconductivity

11 pages, 2 figures. Augmented version to be published in Physical Review B

Scientific paper

We combine neutron scattering (INS) and NMR/NQR nuclear spin lattice relaxation rate data to deduce the existence of a new contribution to the magnetic response (dynamic susceptibility) 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 the dynamic susceptibility at low energies. For La_(1.86)Sr_(0.14)CuO_(4) and YBa_(2)Ba_(3)O_(6.5), the new term is the chief contributor to nuclear spin lattice relaxation at T >> T_(c).

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