L. Sangaletti et al., A PHOTOEMISSION-STUDY OF NA-INDUCED HOLE DOPING IN BI2SR2-Y(NA-Y)CA1-X(NA-X)CU2O8+DELTA, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 19(8-9), 1997, pp. 1159-1166
An X-ray photoelectron spectroscopy study of Na-doped Bi-2212 cuprates
is reported. Core level photoemission spectra were collected, at diff
erent take-off angles, from a monophasic crystal. The results of the l
ineshape analysis and the dependence of the core line intensity on the
analyser take-off angle allowed us to rule out the presence of Na wit
hin the Bi-O layers, indicating that Na+ is very likely replacing Ca2 or Si2+ ions.