Evolution of the resonance and incommensurate spin fluctuations in superconducting YBa2Cu3O6+x

Abstract

Polarized and unpolarized neutron triple-axis spectrometry was used to study the dynamical magnetic susceptibility x"(q,w) as a function of energy (\v) and wave vector (q) in a wide temperature range for the bilayer superconductor YBa2Cu3O61x with oxygen concentrations, x, of 0.45, 0.5, 0.6, 0.7, 0.8, 0.93, and 0.95. The most prominent features in the magnetic spectra include a spin gap in the superconducting state, a pseudogap in the normal state, the much-discussed resonance, and incommensurate spin ¯uctuations below the resonance. We establish the doping dependence of the spin gap in the superconducting state, the resonance energy, and the incommensurability of the spin ¯uctuations. The magnitude of the spin gap (Esg) uptothe optimal doping is proportional to the superconducting transition temperature Tc with Esg/kBTc53.8. The resonance, which exists exclusively below Tc for highly doped YBa2Cu3O61x with x50.93 and 0.95, appears above Tc for underdoped compounds with x

Department(s)

Materials Science and Engineering

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2026 American Physical Society, All rights reserved

Publication Date

2001-02-01

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