Published online by Cambridge University Press: 15 February 2011
There are only a few Fe-based compounds which are superconducting since the depairing of Cooper pairs is unavoidable in the presence of an Fe moment. In Sc2Fe3Si5 and Th7Fe3, Mössbauer measurements on 57Fe show that there is no magnetism at the Fe site in either compound. The isomer shift values indicate the reason behind this identical magnetic behavior to be quite different in its electronic origin.
On leave from the Department of Physics, Monash University, Victoria, Australia.
Work supported by the U.S. Department of Energy.