Abstract
Single crystals of CeCu2Si2 were grown from metal solvents and their magnetic properties were systematically varied by partial substitution of Cu by Sn or In. The susceptibility χ is anisotropic and at high temperatures it is dominated by the crystal field split 4f state. At low temperatures the magnetic moments are drastically reduced. This reduction, as well as the Curie–Weiss temperature, depend sensitively upon the chemical composition. The observed variations both in the magnetic and the resistance behavior point to a Kondo-like coupling between local moments and conduction electrons. The strength of this interaction varies as the Fermi level is shifted by chemical means.
Highlights
CeCu2Si2 is the first compound in which "heavy fermion" superconduetivity was established. 1 The valenee of Ce is close to 3+ and the magnetic properties at temperatures higher than 10 Kare determined by weil defined local4f moments
This temperature a nonmagnetic state develops and the eleetrons at the Fermi level acquire huge effective mass (> 200 m e ).[23]. These heavy fermions condense into a superconducting state at Tc '.:::::'.0.6 K
Because all the original work was done on polycrystalline samples and because it was obvious from the very beginning that the low temperature properties depend sensitively on details of the preparation process1- we started a systematic study of single crystals
Summary
CeCu2Si2 is the first compound in which "heavy fermion" superconduetivity was established. This temperature a nonmagnetic state develops and the eleetrons at the Fermi level acquire huge effective mass (> 200 m e ).23 These heavy fermions condense into a superconducting state at Tc '.:::::'.0.6 K. We find that the degree of "demagnetization" in the low temperature range is sharply reduced when Sn or In atoms Substitute for Cu. We find that the degree of "demagnetization" in the low temperature range is sharply reduced when Sn or In atoms Substitute for Cu We suggest that this is consistent with the picture of the heavy fermions owing their origin to a Kondo-Iike interaetion between the local 4f moments and the conduction eleetrons
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