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Oxygen superstructures throughout the phase diagram of (Y,Ca)Ba₂Cu₃O₆₊ₓ

Strempfer, J.; Zegkinoglou, I.; Rütt, U.; Zimmermann, M. von; Bernhard, C.; Lin, C.; Wolf, T. 1; Keimer, B.
1 Forschungszentrum Karlsruhe (FZKA)


Oxygen superstructures throughout the phase diagram of (Y,Ca)Ba₂Cu₃O₆₊ₓ Short-range lattice superstructures have been studied with high-energy x-ray diffuse scattering in underdoped, optimally doped, and overdoped (Y,Ca)Ba₂Cu₃O₆₊ₓ. A new four-unit-cell superstructure was observed in compounds with x=0.92. The great similarity of the diffuse scattering pattern of the YBa₂Cu₃O$_{6.92}$ compound with the one of Y$_{0.8}$Ca$_{0.2}$Ba₂Cu₃O$_{6.95}$, which has approximately the same oxygen-content but different charge carrier concentration due to the Ca- substitution, clearly indicates that the origin of these superstructures lies in short-range oxygen vacancy ordering rather than in electronic instabilities in the CuO₂ layers. This is further supported by the absolute absence of any significant diffuse scattering in YBa₂Cu₄O₈, a compound that contains no oxygen vacancies. The persistence of the diffuse reflections up to temperatures well above room temperature is also not in favour of the stripe-related scenario for their origin.

DOI: 10.1103/PhysRevLett.93.157007
Zitationen: 29
Web of Science
Zitationen: 28
Zitationen: 29
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2004
Sprache Englisch
Identifikator ISSN: 0420-0195
KITopen-ID: 110057249
HGF-Programm 52.01.01 (POF I, LK 01) Elektr.Eigenschaften.Magnetismus u.SL
Erschienen in Verhandlungen der Deutschen Physikalischen Gesellschaft
Verlag Deutsche Physikalische Gesellschaft (DPG)
Band 93
Heft 15
Seiten Art.Nr. 157007
Nachgewiesen in Web of Science
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