TRANSPORT MEASUREMENTS OF THE HEAVY-FERMION SUPERCONDUCTOR CECU2SI2 UNDER HYDROSTATIC-PRESSURE IN HELIUM

Transport measurements on a single crystal of the heavy fermion superc onductor CeCu2Si2 have been performed under pressure in a diamond anvi l cell with helium as pressure transmitting medium. Probably because o f the very hydrostatic conditions, the superconducting transition is s hown to remain narrow under pressure. The temperature dependence of th e upper critical field, H-c2, is analyzed assuming strong coupling. Th e effective mass is found to decrease consistently with other reports, but the expected sharp increase of T-c under pressure is not found in the sample here. (C) 1998 Elsevier Science Ltd. All rights reserved.