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.
@article{arxiv.cond-mat/0110522,
title = {Systematic X-ray absorption study of hole doping in BSCCO - phases},
author = {R. Mueller and M. Schneider and R. Mitdank and C. Janowitz and R. -St. Unger and A. Krapf and H. Dwelk and W. Frentrup and R. Manzke},
journal= {arXiv preprint arXiv:cond-mat/0110522},
year = {2009}
}
Comments
4 pages, 2 figures, to appear in the proceedings of SCES2001, Ann Arbor, August 6-10, 2001