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Condensed Matter Physics, Strongly Correlated Electron Systems
Abstract:
In the first part of this article, I briey review early research activities concerning strongly corre- lated electron systems, beginning with the discovery of superconductivity and the first observation of a resistance minimum in nominally pure Cu-metal, which was explained many years later by Kondo. I will also address the antagonistic behavior of conventional (BCS) superconductivity and magnetism. The main focus of this paper is on the discovery of non-BCS-type superconductivity in the Kondo-lattice system CeCu2Si2, a prototypical heavy-fermion metal. Here, the superconducting state is created by a periodic lattice of 100% of magnetic Ce3+ ions. Meanwhile, more than fifty lanthanide-, actinide-, and transition-metal-based intermetallic compounds are known to belong to the class of heavy-fermion superconductors. Finally, I will give my personal view of the current knowledge of this kind of unconventional superconductivity. © 2023 The Korean Physical Society. All rights reserved.
