normal metal-superconductor interface

A normal metal-superconductor interface occurs where a standard metal contacts a superconductor, a material that conducts electricity without resistance below a certain temperature. At this boundary, electrons from the metal can enter the superconductor and pair up into special states called Cooper pairs, enabling zero-resistance flow. This process involves a transfer of energy and can cause unique behaviors like reflection of electrons called Andreev reflection. The interface is crucial for understanding how superconductivity interacts with conventional materials, and it impacts technologies like quantum computers and sensitive magnetic detectors.