Abstract
The prototype heavy fermion compound CeCu 2Si 2 exhibits a rather complicated phase diagram at low temperatures. Recently, a number of phase transitions at temperatures above the superconducting T c were discovered. These transitions seem to be correlated with the appearance of superconductivity. We calculate the quasiparticles in CeCu 2Si 2 by means of the renormalized band structure method. The results for the Fermi surface suggest that the new phase transition may be driven by a topological transition in the system of the heavy quasiparticles.
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