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The effect of aluminum substitution on superconductivity in Mg11B2 prepared under a high pressure (HP) of P≈3 GPa was compared with that in (Mg1−xAlx)B2 prepared at ambient pressure (AP). In both the HP and the AP samples, the superconducting transition temperature (Tc) tended to decrease in the same way due to the substitution, but the width of the superconducting transition (90%–10%), ΔTc,...
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