I am trying to find a list with super conductors. In particular I am searching for a superconductor, that consists of 4 elements none of which is Oxygen.
The reason I rejected Oxygen, is because(from the kinematic factor) the maximum energy from scattering with the Oxygen is about $730 keV$.
Therefore-unfortunately-I have to reject YBCO superconductors.
In particular I have to analyse an RBS spectrum of a supposed 4-element well known super conductor.
I can't find any 4-element-superconductor without oxygen. Is there anyone, or it might be the case where the sample is bad described?
Just for reference the RBS spectrum is
I also tested iron based superconductors, but it seems that I need a heavier element. For instance a superconductor containing $Ba, K, Fe, As$ has the following RBS spectrum
Please ignore the concentrations...
The analysis indicates that the superconductors consists of 4 elements which are
Does a superconductor like that really exists? I mean OK about Bismuth or Copper or even Strontium...How about Potassium? The combination of those doesn't seem right to me...