Superconductivity of CeCu2Si2
Aliev F. G. , Brandt N. B. , Lutsiv R. V. , Moshchalkov V. V., Chudinov S. M.
Single crystals of CeCu2Si2 are not superconductors at Τ > 0.05 К and at standard pressure, in contrast with polycrystalline samples, but they go superconducting when compressed. Their superconductivity has an anomalously large ratio Hc2(0)/Tc(0)~ 38 kOe/K and a derivative Hc2/dT(T=Tc(0) —140 kOe/K.