On the Bilayer Coupling in the Yttrium-Barium Family of High Temperature Superconductors

1995/06/20 by A. J. Millis, Millis, A. J., H. Monien +1 · 1 citation
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Scientific Research and Discoveries #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9506088

11 pages, 3 postscript figures (uuencoded and compressed)

arxiv created 1995/06/20 · openalex publication_date 1995/06/20 · arxiv updated 2009/11/30 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28

Abstract

We present and solve a model for the susceptibility of two CuO2 planes coupled by an interplane coupling J_perp and use the results to analyze a recent "cross-relaxation" NMR experiment on Y2Ba4Cu7O15. We deduce that in this material the product of J_perp and the maximum value of the in-plane susceptibility chi_max varies from approximately 0.2 at T = 200 K to 0.4 at T = 120 K and that this implies the existence of a temperature dependent in-plane spin correlation length. Using estimates of chi_max from the literature we find 5 meV < J_perp < 20 meV. We discuss the relation of the NMR results to neutron scattering results which have been claimed to imply that in YBa2Cu3O_6+x the two planes of a bilayer are perfectly anticorrelated. We also propose that the recently observed 41 meV excitation in YBa2Cu3O7 is an exciton pulled down below the superconducting gap by J_perp.

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