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Apparatus to measure magnetic flux quantum

Apparatus to measure magnetic flux quantum

A250/0054

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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 and determine a value of the magnetic flux quantum in a high critical temperature ceramic superconductor, yttrium-barium-copper oxide (Y- Ba2- Cu3-O7-x). The superconductor ring (centre, dark grey) was cooled in liquid helium. A magnetic flux applied by a solenoid (right) was monitored by a superconducting quantum interference device (SQUID) magnetometer (left). The value of the flux quantum thus determined implies that the charge carriers of superconductivity are electron pairs and provides 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,.

Release details

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