Abstract
We have studied the variation of superconducting critical temperature Tc asa function of charge density and lattice parameters in Mg1-xAlxB2superconducting samples. The AB2 heterostucture of metallic boron layers(intercalated by A = magnesium, aluminum layers, playing therole of spacers) is made by direct chemical reaction. The spacing betweenboron layers and their charge density are controlled by chemical substitutionof Mg by Al atoms. We show that high Tc superconductivity is realized bytuning the chemical potential at a `shape resonance' according with the patentfor `high-temperature superconductors made by metal heterostructures at theatomic limit'. The energy width of the superconducting shape resonance isfound to be about 400 meV.
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