Physics – Condensed Matter – Superconductivity
Scientific paper
2001-10-24
Physica B 312-313, 94 (2002)
Physics
Condensed Matter
Superconductivity
4 pages, 2 figures, to appear in the proceedings of SCES2001, Ann Arbor, August 6-10, 2001
Scientific paper
10.1016/S0921-4526(01)01279-0
X-ray absorption spectroscopy (XAS) on the O 1s threshold was applied to Bi-based, single crystalline high temperature superconductors (HTc's), whose hole densities in the CuO2 planes was varied by different methods. XAS gives the intensity of the so-called pre-peak of the O 1s line due to the unoccupied part of the Zhang-Rice (ZR) singlet state. The effects of variation of the number n of CuO2 - planes per unit cell (n = 1,2,3) and the effect of La-substitution for Sr for the n = 1 and n = 2 phase were studied systematically. Furthermore the symmetry of the states could be probed by the polarization of the impinging radiation.
Dwelk Helmut
Frentrup W.
Janowitz Christoph
Krapf Alica
Manzke Recardo
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