Apparatus to measure magnetic flux quantum

Apparatus to measure magnetic flux quantum

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Credit: 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,

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Keywords: conductance, conducting, conductivity, conductor, electronic, high-temp., high-temperature, interference device, magnetic flux, magnetic flux quantum, magnetometer, physics, quantum, squid, superconduct. quantum, superconductor, yttrium-barium-copper oxide

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