What are the charge carriers in superconductors?
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Unlike superconducting metals, in which the charge density is fixed, superconducting semiconductors can be doped with different amounts of carriers, allowing physicists to explore the dependence of superconductivity on carrier density. A well-known example is the doped-band insulator strontium titanate ( SrTiO3).
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Superconductivity is a set of physical properties observed in certain materials where electrical resistance vanishes and magnetic flux fields are expelled from the material. Any material exhibiting these properties is a superconductor.
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