= Fritz London
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{tag=Physicist}
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<Fritz London> and <Heinz London> formulated a phenomenological theory of the magnetic response of <superconductors>. Their equations make a static <magnetic field> decay over a finite <London penetration depth>, explaining field expulsion in the <Meissner effect>. This adds a physical condition beyond the acceleration of a perfectly conducting <electron> fluid. The <London equations> connect a measurable length scale with superconducting currents, providing a useful macroscopic description before a microscopic pairing theory was available.<The electromagnetic equations of the supraconductor by Fritz London and Heinz London>[Proceedings of the Royal Society A 149, 71–88 (1935), superconducting magnetic relation]{ref}
A <physicist> associated with the <London dispersion force> and <London equations>.
\Image[https://upload.wikimedia.org/wikipedia/commons/8/8c/London,Fritz_1928_München.jpg]
{title=Portrait of <Fritz London>}
{description=GFHund, from the Friedrich Hund archive. https://creativecommons.org/licenses/by/3.0/[CC BY 3.0].}
{source=https://commons.wikimedia.org/wiki/File:London,Fritz_1928_München.jpg}
{width=180}
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