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  • 1995-1999  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Angle-resolved photoemission experiments on Bi2Sr2CaCu2O8+δ(001) (1995)
    Springer
    Applied physics 60 (1995), S. 247-254 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 71.25.Hc ; 74.72.Hs ; 79.60.Bm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Core-level X-ray photoelectron-diffraction patterns have been measured from cleaved Bi2Sr2CaCu2O8+δ (001) surfaces for all elements present in this compound. The incommensurate modulation alongb ([010]) leads to a strong inequivalence ofa- andb-directions for Bi, Sr and Cu photoelectrons, while Ca and O emission show less effect. Ultraviolet-photoemission experiments recording the emission intensity at the Fermi energy over a large solid angle are also presented, providing a direct mapping of the Fermi surface. Ac(2×2) superstructure is observed on the Fermi surface suggesting antiferromagnetic correlations within the Cu−O planes. The effects of the lattice modulation are clearly observable at the Fermi energy, and they are enhanced for binding energies higher than a few tens of meV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01538399
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  • 2
    Digitale Medien
    Digitale Medien
    Substitution sites of Pb and Y in Bi2Sr2Ca1Cu2O8+δ: X-ray photoelectron diffraction as fingerprinting tool (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1550-1552 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The substitution site of Y and Pb in the cuprate-type high temperature superconductor Bi2Sr2Ca1Cu2O8+δ is determined in a very direct and unambiguous way by means of angle-scanned x-ray photoelectron diffraction (XPD). Using XPD as a fingerprinting tool, we conclude that Y occupies the Ca sites and Pb the Bi sites, respectively. Furthermore, low-energy electron diffraction data unequivocally show the presence of the incommensurate lattice modulation which is known for pure Bi2212, but not for sufficiently Pb doped Bi2212. We can, therefore, attribute the reappearance of the modulation directly to the Y doping. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.124751
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Controlled underdoping of cuprates using ultraviolet radiation (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1877-1879 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A method for a controlled change of the doping level of high-temperature superconductors with ultraviolet radiation is presented. With photoemission it is shown that the exposure of Bi2Sr2CaCu2O8+δ samples to the light of a He gas-discharge lamp causes oxygen desorption. From measurements of the Fermi surface, it is found that the oxygen desorption causes a decrease of the doping level of the superconductors. From the desorption cross sections that strongly depend on the photon energy, two different oxygen desorption channels are inferred. This procedure for decreasing the doping level has the advantage that the crystallinity of the sample is not altered and that the doping level can be simultaneously measured by photoelectron spectroscopy. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.123699
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  • 4
    Digitale Medien
    Digitale Medien
    Angle-resolved photoemission experiments on Bi2Sr2CaCu2O8+δ(001) Effects of the incommensurate lattice modulation (1995)
    Springer
    Applied physics 60 (1995), S. 247-254 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS:71.25.Hc; 74.72.Hs; 79.60.Bm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract . Core-level X-ray photoelectron-diffraction patterns have been measured from cleaved Bi2Sr2CaCu2- O8+δ (001) surfaces for all elements present in this compound. The incommensurate modulation along b ( [010] ) leads to a strong inequivalence of a- and b- directions for Bi, Sr and Cu photoelectrons, while Ca and O emission show less effect. Ultraviolet-photoemission experiments rec ording the emission intensity at the Fermi energy over a large solid angle are also presented, providing a direct mapping of the Fermi surface. A c(2×2) superstructure is observed on the Fermi surface suggest ing antiferromagnetic correlations within the Cu–O planes. The effects of the lattice modulation are clearly observable at the Fermi energy, and they are enhanced for binding energies higher than a few tens of meV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01538399
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
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