Critical temperatures of some simple metals:
Niobium and vanadium are type-II superconductors, while most other superconducting elements are type-I materials. Almost all compound and alloy superconductors are type-II materials.
The most commonly used conventional superconductor in applications is a niobium-titanium alloy - this is a type-II superconductor with a Tc of 11 K. The highest critical temperature so far achieved in a conventional superconductor was 39 K (-234 °C) in magnesium diboride.
Atomic-Scale Quasi-Particle Scattering Resonances in [Bi.sub.2][Sr.sub.2]Ca[Cu.sub.2][O.sub.8+[Delta]].(Brief Article)
Jul 02, 1999; Impurity atoms and atomic-scale defects, even in very small concentrations, can strongly influence the properties of materials....