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High temp ceramic superconductor

High temp ceramic superconductor

A250/0052

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Credit

LOW TEMPERATURE GROUP, DEPT. OF PHYSICS, UNIVERSITY OF BIRMINGHAM / SCIENCE PHOTO LIBRARY LOW TEMPERATURE GROUP, DEPT. OF PHYSICS, UNIVERSITY OF BIRMINGHAM / SCIENCE PHOTO LIBRARY

Caption

Experimental apparatus used to observe & determine a value of the magnetic flux quantum in the high- temperature ceramic superconductor, yttrium- barium-copper oxide (Y-Ba2-Cu3-O7-x). The super- conductor ring (centre, dark grey) was cooled in liquid helium. A magnetic flux applied by a solenoid (right) was monitored by a supercond- ucting quantum interference device (SQUID) magnetometer (left). The value of the flux quantum thus determined implies that the charge carriers of superconductivity are electron pairs & gives a dramatic demonstration of quantum mechanics on a macroscopic scale. A paper describing this experiment was first published by Gough et al in Nature, volume 326,.

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