Zinc-induced modification of the dynamical magnetic susceptibility in the superconducting state of YBa{sub 2}Cu{sub 3}O{sub 6+}{sub {ital x}} as revealed by inelastic neutron scattering

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.6811· OSTI ID:279046

Sidis, Y; Bourges, P; Hennion, B ^[1]; Regnault, L P ^[2]; Villeneuve, R; Collin, G ^[1]; Marucco, J F ^[3]

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1. Laboratoire Leon Brillouin, CEA-CNRS, Centre dEtudes de Saclay, 91191 Gif-sur-Yvette (France)
2. Centre dEtudes Nucleaires de Grenoble, Departement de Recherche Fondamentale sur la Matiere Condensee, Service de Physique Statistique, Magnetisme et Supraconductivite, Groupe Magnetisme et Diffraction Neutronique, 85 X, 38041 Grenoble cedex (France)
3. Laboratoire des Composes Non-Stoechiometriques, CNRS URA 446, Batiment 415, Universite Paris Sud centre dOrsay, Orsay (France)

Inelastic-neutron-scattering measurements have been performed to determine the imaginary part of the dynamical susceptibility, {chi}{double_prime}({ital Q},{omega}), of a YBa{sub 2}(Cu{sub 1{minus}{ital y}}Zn{sub {ital y}}){sub 3}O{sub 6.97} sample exhibiting a superconducting transition at {ital T}{sub {ital c}}=69 K. Zinc substitution induces striking modifications of the energy dependence of {chi}{double_prime}({ital Q},{omega}) but magnetic fluctuations remain peaked at the antiferromagnetic wave vector, {ital Q}{sub AF}, at all investigated energies. In the superconducting state of the zinc-free compound, {chi}{double_prime}({ital Q},{omega}) is restricted to a narrow energy range, {h_bar}{omega}=33{endash}47 meV, displaying a {ital spin} {ital gap} at {ital E}{sub {ital G}}=33 meV and a resonant enhancement at {ital E}{sub {tau}}=39 meV, both features vanishing upon heating up above {ital T}{sub {ital c}}. In the {ital y}=0.02 substituted sample in the superconducting state, there is still an energy band in the range 32{endash}47 meV but no clear resonance, and a signal is now observed in the low energy range, though the line shape of {chi}{double_prime}({ital Q},{omega}) indicates some reminiscence of the spin gap of the pure compound. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279046
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BARIUM OXIDES
COPPER OXIDES
ENERGY GAP
FREQUENCY DEPENDENCE
HIGH-TC SUPERCONDUCTORS
HOLES
INELASTIC SCATTERING
LANTHANUM OXIDES
LINE SHAPE
MAGNETIC SUSCEPTIBILITY
NEUTRON SPECTROSCOPY
OXYGEN
YTTRIUM OXIDES
ZINC