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Why Do Superconductors Expel Magnetic Fields? Understanding the Meissner Effect

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After becoming interested in superconductors, I noticed something familiar while watching Avatar: Unobtanium, the fictional material that appears in the movie. Seeing it suspended in the air made me wonder: “Could this be something like a superconductor?” (AI-generated image) Of course, Unobtanium is fictional. But that scene made me even more curious about superconductivity. As I began looking into how real superconductors interact with magnetic fields, I came across one of their most fascinating properties: the Meissner effect. So what exactly is the Meissner effect, and why is it so important to understanding superconductivity? The Meissner Effect: Expelling Magnetic Fields In my previous article, I explored how superconductivity was discovered in 1911, when the electrical resistance of mercury was found to disappear at extremely low temperatures. Zero electrical resistance is probably the best-known property of a superconductor. [2] But it is not the whole story. Superconductors al...
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What Is a Superconductor? How Zero Electrical Resistance Was Discovered in 1911

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My interest in superconductors began with a very simple question. While watching a YouTube video, I came across the idea that if electrical resistance could be eliminated, it could reduce energy loss and the heat produced as electricity flows. The first thing that came to mind was my smartphone. Smartphone heat was one of the questions that first led me to learn about electrical resistance and superconductivity. Anyone who has used a phone for a long time or played a demanding game has probably noticed how warm it can become. That made me wonder: If a material really had zero electrical resistance, could it help reduce this kind of heat? As I looked into the subject, I learned that smartphone heat is much more complicated than electrical resistance alone. Heat can come from many parts of a phone, including semiconductor power consumption, the battery, display, and wireless communication. Still, that simple question was what led me to start learning about sup...
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