Decisive weaknesses of the superconductor magnesium diboride
Robert j. Cava and his colleagues at princeton university have discovered that the new superconductor (new superconductor magnesium diboride) has critical weaknesses. Jun akimitsu of aoyama-gakuin university in japan and colleagues from other universities had found that magnesium boride could be cooled at the temperature of 39 kelvin (minus 234.15 degrees celsius) has superconducting properties. In the same ie of nature in which they presented their results, robert cava had commented enthusiastically on the groundbreaking discovery: "sensational!". The princeton physicist and superconductor specialist was excited by this simple substance, which can be bought in any chemistry supply store for very little money. It was clear from the start that mgb2 was not a dream material, but experts have repeatedly achieved decisive performance improvements in superconductors in the past, even with minor changes. Cava immediately set to work with his colleagues to test the properties of magnesium boride.
A superconducting ring whose thickness is much coarser than the london penetration depth. The dotted lines symbolize magnetic flux penetration.