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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.; Keimer, B.

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.

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DOI: 10.1103/PhysRevLett.93.157007
Zitationen: 26
Web of Science
Zitationen: 25
Seitenaufrufe: 8
seit 01.05.2018
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2004
Sprache Englisch
Identifikator ISSN: 0420-0195
KITopen-ID: 110057249
HGF-Programm 52.01.01 (POF I, LK 01)
Erschienen in Verhandlungen der Deutschen Physikalischen Gesellschaft
Band 93
Heft 15
Seiten Art.Nr. 157007
Nachgewiesen in Web of Science
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