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<p>and <a href="page.php?w=cosmology">cosmology</a>.</p>

<p>Also in 1950, Maxwell and Reynolds et al. found that the critical temperature of a superconductor depends on the <a href="page.php?w=Isotope">isotopic mass</a> of the constituent element. This important discovery pointed to the <a href="page.php?w=electron">electron</a>-<a href="page.php?w=phonon">phonon</a> interaction as the microscopic mechanism responsible for superconductivity.</p>

<p>The complete microscopic theory of superconductivity was finally proposed in 1957 by <a href="page.php?w=John_Bardeen">Bardeen</a>,</p><p>
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