A pellet of a superconducting compound demonstrating the Meissner effect. Superconductors are materials that have no electrical resistance,usually when cooled to extremely low temperatures. The pellet seen here is a ceramic compound of copper oxide with barium and lanthanum. When cooled to about 20 Kelvin (-253 Celsius) with liquid hydrogen,the pellet becomes superconducting. The Meissner effect is the exclusion of magnetic fields by a superconductor. Normally the pellet would rest within the field between the poles of the magnet seen here,but when superconducting it is expelled by the field | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / US Department of Energy |
Bildgröße: | 3756 px × 4685 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |