SUPERCONDUCTIVE TRANSITIONS OF DIFFERENT TYPE-2 COMPOUNDS UNDER HYDROSTATIC PRESSURE

An apparatus for production of hydrostatic pressure is described using a mixture of n-pentane and iso-pentane, which transmits pressure uniformly still at low temperatures. The superconductive transitions of the A 15(β- W type)-compounds Nb3Sn, Nb3Al, V3Si and the B 1(NaCl type)-compound NbN have been measured under pressure up to 18 · 103 kp/cm2. The transition temperatures of the compounds V3Si and NbN are increasing with pressure. Further measurements have been done on some selected ternary compounds, e.g. Nb3(Al1-xGex), to prove some predictions for the effect of pressure on superconductive transition. © 1969 Springer-Verlag.