Reversible Tuning of the Heavy Fermion Ground State in CeCoIn$_5$
  Cadmium-doping the heavy-fermion superconductor CeCoIn$_5$ at the percent level acts as an electronic tuning agent, sensitively shifting the balance between superconductivity and antiferromagnetism and opening new ambient-pressure phase space in the study of heavy-fermion ground states. 
L. D. Pham, Tuson Park, S. Maquilon, J. D. Thompson, Z. Fisk