High-pressure studies on heavy fermion systems
Chen Ye, Weng Zongfa, Michael Smidman, Lu Xin†, , Yuan Huiqiu‡,
       

The pressure–temperature phase diagram of CeCu2(Si1−xGex)2. The pressure on the x axis is shifted by the corresponding critical pressure pc1(x) at the antiferromagnetic QCP. Two superconducting states merge together in CeCu2Si2 under pressure (adapted from Ref. [77]).