
%0 Journal Article
%A Dobson, JF 
%A Bocquet, AE 
%A Healy, PC 
%A Myhra, S 
%A Stewart, AM 
%A Thompson, JG 
%T X-ray Photoelectron Studies of High-temperature Superconductors: Evidence for the Importance of Alkaline Earth Metals
%J Australian Journal of Physics
%D 1989/08/01
%V 42
%N 4
%P 409-412
%K 
%R https://doi.org/10.1071/PH890409
%U https://www.publish.csiro.au/paper/PH890409 
%X All high·temperature superconducting ceramics so far studied contain alkaline-earth ions, and in all cases core-level X-ray photoelectron spectroscopy shows an anomalous low-binding energy peak from these ions. We argue that this may point to electron-rich alkaline earth layers. These should be highly polarisable, allowing them to facilitate uperconductivity by screening the repulsion between electrons and/or holes in the CuD layers. 
