These materials contain Cooper pairs according to BCS theory.
In December 2014, a paper on the arXiv ("archive") claimed that hydrogen sulfide behaved as one of these substances in a diamond anvil at 150 gigapascals. Albert Einstein proposed an incorrect model in which these materials were made of "molecular chains." Bernd Matthias proposed an early set of rules to predict these substances, which were violated by the ones discovered by Matthias' student Paul Chu. A particle impinging on one of these materials can produce a retroreflected hole and a (*) charge transfer of 2e, a process called Andreev reflection. Magnesium diboride has the highest known critical temperature among the conventional type of these materials, while the cuprate YBCO was the first one discovered above the boiling point of liquid nitrogen. These materials contain Cooper pairs according to BCS theory. For 10 points, name these materials that exhibit the Meissner effect and have zero electrical resistance.
In December 2014, a paper on the arXiv ("archive") claimed that hydrogen sulfide behaved as one of these substances in a diamond anvil at 150 gigapascals.
superconductors