Quantum obstacle course changes material from superconductor to insulator

Researchers have demonstrated an unusual method of putting the brakes on superconductivity, the ability of a material to conduct an electrical current with zero resistance. The research shows that weak magnetic fields -- far weaker than those that normally interrupt superconductivity -- can interact with defects in a material to create a "random gauge field," a kind of quantum obstacle course that generates resistance for superconducting electrons.

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