This review paper illustrates the main normal and superconducting state properties of
magnesium diboride, a material known since the early 1950s but only recently discovered to …

In this review article we consider theoretically and give experimental support to the models
of the Fermi-Bose mixtures and the BCS-BEC (Bardeen Cooper Schrieffer–Bose Einstein) …

Resonances in the superconducting properties, in a regime of crossover from BCS to mixed
Bose-Fermi superconductivity, are investigated in a two-band superconductor where the …

Emerets's experiments on pressurized sulfur hydride have shown that H3S metal has the
highest known superconducting critical temperature Tc= 203 K. The Emerets data show …

We have studied the structural and electronic properties of Mg 1− x Al x B 2 within the virtual
crystal approximation (VCA) by means of first-principles total-energy calculations. Results for …

Recent experiments have reported the emergence of high-temperature superconductivity
with critical temperature T c between 43 K and 123 K in a potassium-doped aromatic …

While it is known that a resonant amplification of T c in two-gap superconductors can be
driven by using the Fano–Feshbach resonance tuning the chemical potential near a Lifshitz …

We report experimental data showing the Feshbach shape resonance in the electron doped
MgB 2 where the chemical potential is tuned by Al, Sc, and C substitutions. The scaling of …

Here we report the synthesis and characterization of Mg 1− x Sc x B 2 (0.12< x< 0.27)
system, with critical temperature in the range of 30> T c> 6 K. We find that the Sc do** …

Raman and infrared absorption spectra of Mg 1− x Al x B 2 have been collected for 0<~ x<~
0.5 in the frequency range of the phonon spectrum. The data show a remarkable …