Options
1985
Journal Article
Title
Calorimetric investigation under high pressure of the heavy Fermion Superconductor CeCu2Si2
Abstract
The heavy fermion compound CeCu2Si2 is commonly regarded as a Kondo lattice system. Though it has been shown that the heavy mass quasiparticles participate in its superconductivity below about 0.7 K, a detailed understanding of the interdependence of the superconducting and the Kondo lattice parameters is still to be developed. The application of pressure is one useful approach to study this problem. In this paper we present results of specific heat measurements between 0.3 K and 2 K under pressures up to 5.9 kbar. While in our sample Tc hardly changes, the normal state specific heat, which is exclusively of electronic origin in the present temperature range, is rapidly decreased in a monotonous way, qualitatively corresponding to the expected rise of the Kondo temperature with pressure. In contrast to this behaviour, a strong nonlinear change of the jump Alpha C(Tc) passing through a maximum near 3 kbar is obeserved. We suggest that this reflects changes of the Kondo lattice coherence structure in the quaisparticle density of states near EF.