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Universal magnetic excitation spectrum in cuprates

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arxiv cond-mat/0411082 v1 pith:6473JV4V submitted 2004-11-03 cond-mat.supr-con cond-mat.str-el

J.M. Tranquada , H. Woo , T.G. Perring , H. Goka , G.D. Gu , G. Xu , M. Fujita , K. Yamada This is my paper
classification cond-mat.supr-concond-mat.str-el
keywords magneticspectrumexcitationspincuprateobservedscatteringuniversal
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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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