Die Übergangstemperatur verschiedener Supraleiter zweiter Art unter hydrostatischem Druck

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(Al_1?x Ge _x ), to prove some predictions for the effect of pressure on superconductive transition.