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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / University of Birmingham / Dept. of Physics / Low Temperature Group |
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