Magnetic flux quantum


The magnetic flux quantum Φ<sub>0</sub> is the quantum of magnetic flux passing through a superconductor. The inverse of the flux quantum, 1/Φ<sub>0</sub>, is called the Josephson constant, and is denoted K<sub>J</sub>. The quantization of magnetic flux is closely related to the Aharonov-Bohm effect, but was predicted earlier by F. London in 1948 using a phenomenological model.