Type "one and a half" superconductors

Materials scientists, chemists and physicists have known that there are two types of superconductivity - Type I and Type II. But, in the centenary of the discovery of the phenomenon of zero-resistance materials, scientists at the University of Massachusetts Amherst and Sweden's Royal Institute of Technology have published what they describe as a fully self-consistent theory of the third kind of superconducting behavior, Type 1.5, which lies between the two well-known types and has characteristics previously thought to be mutually exclusive and unique to each. The new understanding could help researchers determine what characteristics and conditions are needed to make new Type 1.5 superconductors.