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Journal Article

Unconventional Superconductivity in the Kondo-lattice System CeCu2Si2

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Steglich,  Frank
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Steglich, F. (2023). Unconventional Superconductivity in the Kondo-lattice System CeCu2Si2. New Physics: Sae Mulli, 78(12), 1067-1085. doi:10.3938/NPSM.73.1067.


Cite as: https://hdl.handle.net/21.11116/0000-000E-2900-4
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.