Anomalous change in the de Haas-van Alphen oscillations of CeCoIn${}_5$ at ultra-low temperatures

Hiroaki Shishido, Shogo Yamada, Kaori Sugii +3

We have performed de Haas-van Alphen (dHvA) measurements of the heavy-fermion superconductor CeCoIn${}_5$ down to 2 mK above the upper critical field. We find that the dHvA amplitude…