London moment

The London moment is a quantum-mechanical phenomenon whereby a spinning superconductive metal sphere generates a magnetic field whose axis lines up exactly with the spin axis. The term may also refer to the magnetic moment of any rotation of any superconductor, caused by the electrons lagging behind the rotation of the object.

Etymology

Named for the physical scientist Fritz London, and moment as in magnetic moment.

References

* http://einstein.stanford.edu/content/education/EducatorsGuide/Page17.html