EFFECTS OF CA SUBSTITUTION ON THE ELECTRONIC-STRUCTURE OF ND2-X-YCEXCAYCUO4-DELTA

Authors
CHEN XH LI TF YU M CAO LZ LI Q XU PS ZHANG XY
Citation
Xh. Chen et al., EFFECTS OF CA SUBSTITUTION ON THE ELECTRONIC-STRUCTURE OF ND2-X-YCEXCAYCUO4-DELTA, Physical review. B, Condensed matter, 56(9), 1997, pp. 5673-5676
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
56
Issue
9
Year of publication
1997
Pages
5673 - 5676
Database
ISI
SICI code
0163-1829(1997)56:9<5673:EOCSOT>2.0.ZU;2-Y
Abstract
The effects of Ca substitution on the core levels and valence electron ic scares of Nd2-x-yCexCayCuO4-delta have been studied using x-ray-pho toelectron spectroscopy. It is found that the fraction of monovalent C u derived from the Cu-2p spectra apparently increases with increasing Ca concentration. Ca doping leads to an enhancement in the density of states at the Fermi level for superconducting Nd1.85-yCe0.15CayCuO4-de lta. This could arise from Ca doping making it easier to lose oxygen f rom the samples and lead to an increase in electron carriers.