Due to magnetism, iron should – theoretically – be a poor superconductor. Nevertheless certain iron based materials possess fine superconducting properties. Why? Because the five unbound electrons found in iron – as a result of individual modes of operation, it turns out – facilitate superconductivity.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/07/170707095802.htm
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