New states in SmS ?

Quasihydrostatic pressure resistivity experiments on a single crystal of SmS are reported up to 27.5 kbar. At low temperature, a regime change occurs at P ∼ 20 kbar, between a "quasiinsulating" behavior (P < 20 kbar) and a metallic ground state (P 20 kbar). Striking similarities appear with TmSe and TmS cases. © 1981.