Graceli mechanics of superconductivity.
Effects 4,921 to 4,930.
It has for superconductivity a system of semi-critical variable point according to categories of materials and phenomena [as mentioned below], involving temperature, electricity, materials, magnetism, radioisotopes, effects, transcendent states, phenomenal dimensionality, effects, and chains , And categories of transformations and interactions of ions and charges.
Thus an intricate and mechanical system for superconductivity is formed.
Superconductors are materials that lose resistance to electrical current when they are below a certain temperature.

The term superconductors has been used to denote all materials that, below a certain critical temperature, Tc, lose resistance to the passage of electric current, besides presenting other properties.

From the initial discovery, superconductivity has been sought in various materials, and especially metals, which are naturally good conductors of electricity. In1929, the record Tc was with the Niobium at 9.25 K; In 1941 with the Niobium-Nitrogen alloy in 16 K; As early as 1953 with the Vanadium-Silicon alloy at 17.5 K; And so on. Until 1986, the record Tc was with the Niobium and Germanium alloy at 23.2 K, when the high-temperature superconductors were discovered. The superconductivity at low temperatures described in 1957 by the BCS theory,


 New superconducting ceramics and dozens of them were discovered by raising the record-high Tc to an incredible 138 K for the compound Hg0.8Tl0.2Ba2Ca2Cu3O8.33 at ambient pressure. In contrast, demand for new superconducting metal compounds has been pushed aside by the enthusiasm generated by the possibilities opened up by the discovery of high Tc superconductors. In January 2001, the scientific community is shaken again with the discovery of superconductivity in the metal compound MgB2 at 39.2 K. No less than 16 K greater than any hitherto known metal compound.