Superconductivity Superconductivity Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic flux fields occurring in certain materials, called superconductors, when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911, in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor during its transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of
Leiden Law School result of this policy, the old Kamerlingh Onnes Laboratory, named after physicist Heike Kamerlingh Onnes, was restyled into a new home for the law school; the move was completed in 2004. A reorganisation of the faculty, which began in the 1980s, realigned the faculty's focus to major fields such as civil, corporate, notarial, criminal, European and international law; these areas remain Leiden's traditional areas of scholarly strength. The Cleveringa Institute was established in 2001 to maintain the integrity of teaching and intellectual rigour in courses. The faculty's research was moved to the E.M. Meijers Institute in 1997 and emphasised interdisciplinary