SMB6 AT HIGH-PRESSURES - THE TRANSITION FROM INSULATING TO THE METALLIC KONDO LATTICE

Temperature dependences of the resistivity have been studied in SmB//6 at pressures p less than equivalent to 120 kbar. The suppression of the gap and the transition to the metallic conductivity observed at p greater than equivalent to 55 kbar is explained within the framework of the model which treats SmB//6 at p equals 0 as well as SmS at 6 kbar less than equivalent to p less than equivalent to 19 kbar as insulating Kondo lattices with J greater than J//c and n//m equals 1. The authors also report here preliminary results on SmB//6 current-voltage characteristics, and on magnetic (H-T) phase diagrams of CeB//6 at pressures p less than equivalent to 11 kbar.