Quasiparticle and spin excitations for two coupled Hubbard planes and comparison with experiments on bilayer YBa{sub 2}Cu{sub 3}O{sub 6+{ital x}}
- Abteilung fuer Theoretische Festkoerperphysik, Universitaet Hamburg, Jungiusstrasse 11, D-20355 Hamburg (Germany)
We use the fluctuation-exchange approximation on the real-frequency axis to calculate the quasiparticle self-energies and dynamic spin susceptibilities for the bonding and antibonding bands of two Hubbard planes coupled by interlayer hopping {ital t}{prime}. In the normal state we find that for increasing {ital t}{prime} ({approx_gt}0.3{ital t}) the interband spin susceptibility {chi}{sup {minus}} becomes much larger than the intraband susceptibility {chi}{sup +}. The {ital q{searrow}}, {omega}, and {ital T} dependence of Im{chi}{sup {minus}} agrees qualitatively with magnetic neutron scattering data on YBa{sub 2}Cu{sub 3}O{sub 6+{ital x}}. The ratio of the interlayer and intralayer spin-echo decay rates, {ital T}{sub 2}/{ital T}{sub 2}{sup {asterisk}}, becomes for {ital t}{prime}=0.3{ital t} roughly equal to the recent data of nuclear-quadrupole-resonance spin-echo double resonance. The splitting of the renormalized Fermi lines has about the same magnitude as the splitting observed by angle-resolved photoemission spectroscopy. The superconducting transition temperature for {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}}-wave pairing decreases rapidly as {ital t}{prime} increases above {ital t}{prime}{approx_equal}0.3{ital t}. Our results for the reductions of intraplane magnetic correlations and pairing correlations by interlayer hopping are consistent with results of quantum Monte Carlo simulations. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 383259
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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