Universal magnetic excitation spectrum in cuprates

Details Universal magnetic excitation spectrum in cuprates Universal magnetic excitation spectrum in cuprates

2004-11-03

arxiv.org/abs/cond-mat/0411082v1

Physics

Condensed Matter

Superconductivity

6 pp, 2 figures, submitted to the proceedings of SNS 2004

Scientific paper

We have recently used inelastic neutron scattering to measure the magnetic excitation spectrum of La(1.875)Ba(0.125)CuO(4) up to 200 meV. This particular cuprate is of interest because it exhibits static charge and spin stripe order. The observed spectrum is remarkably similar to that found in superconducting YBa(2)Cu(3)O(6+x) and La(2-x)Sr(x)CuO(4); the main differences are associated with the spin gap. We suggest that essentially all observed features of the magnetic scattering from cuprate superconductors can be described by a universal magnetic excitation spectrum multiplied by a spin gap function with a material-dependent spin-gap energy.

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