Abstract
The normal state of magnesium diboride, the simplest metallic system showing the macroscopic quantum coherence at high temperature (high T c superconductivity––HTcS) shows some features that are common with the cuprates, shedding light on the pairing mechanism for T c amplification in HTcS: (1) two or more electronic components associated with multiple Fermi surface portions; (2) crossing of electronic topological transitions (ETT) where the Fermi surface changes its topology and (3) phonon softening in extended Kohn anomalies (EKA) over a large wave-vector range.
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