12-06-2012, 01:58 PM
JOSEPHSON JUNCTION FOR OBSERVABLE EFFECTS IN SUPERCONDUCTORS
OBSERVABLE EFFECTS IN SUPERCONDUCTORS.doc (Size: 27 KB / Downloads: 25)
1. Zero resistance: Zero resistance at temperatures below the critical temperature. This causes no power loss in the device.
2. Messiner – Oschenfield effect: There is complete expulsion of magnetic field from the interior of the Superconductor. The magnetic inductance becomes zero when it is cooled below TC in a week magnetic field HC, above which superconductivity disappears. This field is temperature dependent. The expulsion of magnetic flux causes source magnetic energy.
So long as this cost is less than the consideration energy gained by going from the normal to the superconductivity becomes too large, the cost in magnetic energy will outweigh the gain in consideration energy, and the super conduction will become partially or totally normal.
3. Flux quantization: Magnetic flux is classically considered as continuous but quantum mechanically it is quantized and exists only as an integral multiple of the basic quanta of magnetic flux called fluxon.
4. Ohm’s law and Kirchhoff’s law: Another important notable effect is that both Ohm’s law and Kirchhoff’s law of current and voltage are invalidated in superconducting states. There are other laws, which govern the voltage- current relationships.