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The property possessed by some substances below a certain temperature, the transition point, of zero resistance. Until recently, the known superconducting materials had very low transition points. However, synthetic organic conductors and certain metal oxide ceramics have now been produced that become superconducting at much higher temperatures. For example, much work has been done on ytterbium-barium-copper oxides, which have transition temperatures of about 100 K.

Subjects: Physics.

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