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Magnesium diboride, recently discovered as superconductor, is extremely interesting in respect to pairing mechanisms and phonon-mediated superconductivity, but its transition temperature (39K) is decidedly too low for practical applications. A rush for substitutions started, intended to raise T c and possibly maintain acceptable critical current density. The difficult introduction of Cu was...
The investigation of Zn substitution in MgB 2 polycrystalline samples shows that about 0.1 Zn can be substituted in the structure of Mg deficient samples while it can not be substituted in stoichiometric MgB 2 . As a result of the isovalent Zn substitution into the Mg position of Mg deficient samples the a and c lattice constants increase by about 0.17% and 0.2% respectively. Susceptibility...
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