ANISOTROPY OF THE PRESSURE DERIVATIVES OF THE SPECIFIC-HEAT AND THE DENSITY OF ELECTRON-STATES IN THE HEAVY-FERMION SYSTEM CECU2SI2

Through an analysis of experimental data of Lang et al. [Phys. Scripta 39, 135 (1991)] on the thermal expansion of a CeCu2Si2 single crystal, it is shown that the pressure derivatives of the jump in the specific heat at the superconducting transition and of the effective density of electron states are strongly anisotropic. The results of the analysis are compared with experiments by Bleckwedel and Eichler [Solid State Commun. 56, 693 (1985)] on the pressure dependence of the specific heat in a polycrystalline CeCu2Si2 sample.