An experimental physicist who reported the superconducting isotope effect in Mercury in 1950. He compared natural Mercury with isotopically enriched samples, detected the destruction of superconductivity magnetically and extrapolated the critical-field curve to zero magnetic field to obtain the transition temperature. The dependence on isotopic mass showed that changing the atomic nucleus could alter superconductivity, motivating theories involving the motion of the chemical atoms in a crystal.[ref]
Isotope Effect in the Superconductivity of Mercury by Emanuel Maxwell. p. 477: sample preparation, magnetic detection and extrapolation of the critical-field curve
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