Faculté des sciences

Substitution sites of Pb and Y in Bi2Sr2Ca1Cu2O8+δ : X-ray photoelectron diffraction as fingerprinting tool

Pillo, Th. ; Hayoz, J. ; Schwaller, P. ; Berger, H. ; Aebi, Philipp ; Schlapbach, Louis

In: Applied Physics Letters, 1999, vol. 75, no. 11, p. 1550-1552

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,... Plus

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    Summary
    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.