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  • 1
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124751
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  • 2
    Electronic Resource
    Electronic Resource
    A system with a complex phase transition: Indium chains on Si(111) (2001)
    Springer
    The European physical journal 20 (2001), S. 313-319 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.30.+h Metal-insulator transitions and other electronic transitions – 71.45.Lr Charge-density-wave systems – 79.60.-i Photoemission and photoelectron spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We examined in detail the geometric and electronic structure of thin In chains on vicinal Si(111) surfaces by means of low energy electron diffraction and ultrahigh-resolution photoemission as a function of temperature. Our data reveal a transition around T c = 115 K from a high temperature ( 4×1)- to a low temperature ( 8×2)-phase being reversible with a small hysteresis of the order 10 K. ARPES spectra exhibit clearly important concomitant changes in the electronic band structure near the Fermi surfaces and at the border of the surface Brillouin zones. We derive the dispersive behavior of the bands involved in the transition in detail and demonstrate that at least two surface state bands m2 and m3 show the opening of a pseudo energy gap on the Fermi surface leaving small but finite spectral weight in the low-temperature state. We conclude that this transition is probably driven by a similar but more complex mechanism than in a conventional Peierls transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01352592
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