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  • 11
    ISSN: 1573-7357
    Keywords: 74.25 Jb ; 74.72 Jt ; 79.60 Bm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report polarization-dependent angle-resolved photoemission studies of single crystalline Ba2Cu3O4Cl2. This antiferromagnet adopts a layered body-centered tetragonal structure related to that of the cuprates, but with anextra copper site resulting in a plane with Cu3O4 stoichiometry. For the Γ-M direction of the Brillouin zone we observe a dispersive feature with a bandwidth of 400 ±80 meV, which approaches to within ∼ 0.9 eV of the Fermi level at (π/2,π/2). The magnitude of the observed dispersion and its polarization dependence are consistent with its origin as a purely antibonding combination of O2px,y and $$Cu3d_{x^2 - y^2 }$$ atomic orbitals from the cuprate-like CuO2 sub-system, i.e. Zhang-Rice singlets.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 875-881 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die supraleitende Phase YBa2Cu3O x wurde mit Hilfe von Thermogrametrie und barometrischen Messungen im Bereich 300 bis 1200 K untersucht. Die sogar bei 250 °C beobachtete Reversibilität des Austausches von einem Teil des Sauerstoffs sowie die gefundenen Beziehungen zwischen Sauerstoffaktivität (Partialdruck), Sauerstoffgehalt und Temperatur können durch eine Lösung von Sauerstoff in YBa2Cu3O x erklärt werden. Aus den Ergebnissen kann gefolgert werden, daß Proben mit hohemx (≈7), die gute Supraleitungseigenschaften zeigen, bei hohen Temperaturen nőr unter hohem Sauerstoffdruck hergestellt werden können. Sie werden jedoch auch durch Tempern bei Normaldruck bei 250 bis 350 °C erhalten.
    Abstract: Резюме Проведены термограв иметрические и барометрические изм ерения сверхпроводн ика YBa2Cu3Ox в контролируемой атмосфере кислорода и в интервале температу р 300–1200 К. Полная обратимость о бмена определенной ч асти кислорода, найденная даже при 250°, и наблюдаемая взаимос вязь между парциальн ым давлением кислорода, его содерж анием и температурой, могут б ыть объяснены раство рением кислорода в YBa2Cu3Ox. Сдела но заключение, что образ цы с высоким значение м х (≈ 7), являющимся необходи мым для хороших сверхпроводящих сво йств, могут быть получ ены при высоких температура х только при ввсоких давлениях кислорода. Вместе с тем, такие обр азцы могут быть получены путем о тжига при нормальном давлении кислорода и при темпе ратурах между 250 и 350°.
    Notes: Abstract Thermogravimetry in controlled oxygen atmospheres and barometric measurements between 300 and 1200 K were performed on the YBa2Cu3O x superconducting phase. The complete reversibility of the exchange of a certain part of the oxygen, as found even at 250 °C, and the observed relationship between oxygen partial pressure, oxygen content and temperature, can be explained by the dissolution of oxygen in YBa2Cu3O x . It is concluded that samples with highx values (≈), as necessary for good superconducting properties, can be obtained at high temperatures only at high oxygen pressures, but they were obtained by annealing at normal pressure between 250 and 350 °C.
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