Superconductivity Discovered by Chemical Doping

 

Guanghan Cao

Department of Physics, Zhejiang University

 

Superconductivity, first described by its discoverer Kamerlingh Onnes, has remained fascinating for nearly one century. One of the reasons is the continuing discovery of new superconducting materials. Before 1980s, most superconductors belong to simple metals and alloys, which can be well understood in terms of Bardeen-Cooper-Schrieffer (BCS) theory. In recent thirty years various kinds of superconductors have been discovered incidentally or rationally, including high Tc cuprates and iron-based pnictides, where the BCS mechanism is in most cases no longer appropriate. Instead of exploring superconductivity in a pure compound, one has been aware of a strategy of finding exotic superconductivity by chemical doping.

 

In this talk I shall first review the history of superconducting materials. Then I’ll show some examples of doping-induced superconductivity (DISC), including the very recent results of DISC in iron-based superconductors. Finally the prospects of DISC will be presented.