Portrait of Walther Meissner
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The term "Walther Meissner" likely refers to Walther Meissner (1882–1974), a German physicist renowned for his work in the field of superconductivity. He is best known for discovering the Meissner effect in 1933, which is a fundamental characteristic of superconductors. The Meissner effect describes the phenomenon where a superconductor expels magnetic fields from its interior when it is cooled below a certain critical temperature.