Critical Temperature |
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| The critical temperature for
superconductors is the temperature at which the
electrical resistivity of a metal drops to zero. The
transition is so sudden and complete that it appears to
be a transition to a different phase of matter; this
superconducting phase is described by the BCS theory.
Several materials exhibit superconducting phase
transitions at low temperatures. The highest critical
temperature was about 23 K until the discovery in 1986 of
some high temperature superconductors. Materials with critical temperatures in the range 120 K have received a great deal of attention because they can be maintained in the superconducting state with liquid nitrogen (77 K). |
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http://hyperphysics.phy-astr.gsu.edu/hbase/solids/scond.html |
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