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Journal Article

Revealing the Heavy Quasiparticles in the Heavy-Fermion Superconductor CeCu2Si2


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

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Wu, Z., Fang, Y., Su, H., Xie, W., Li, P., Wu, Y., et al. (2021). Revealing the Heavy Quasiparticles in the Heavy-Fermion Superconductor CeCu2Si2. Physical Review Letters, 127: 067002, pp. 1-6. doi:10.1103/PhysRevLett.127.067002.

Cite as: https://hdl.handle.net/21.11116/0000-0009-1FD1-9
The superconducting order parameter of the first heavy-fermion superconductor CeCu2Si2 is currently under debate. A key ingredient to understand its superconductivity and physical properties is the quasiparticle dispersion and Fermi surface, which remains elusive experimentally. Here, we present measurements from angle-resolved photoemission spectroscopy. Our results emphasize the key role played by the Ce 4f electrons for the low-temperature Fermi surface, highlighting a band-dependent conduction-f electron hybridization. In particular, we find a very heavy quasi-two-dimensional electron band near the bulk X point and moderately heavy three-dimensional hole pockets near the Z point. Comparison with theoretical calculations reveals the strong local correlation in this compound, calling for further theoretical studies. Our results provide the electronic basis to understand the heavy-fermion behavior and superconductivity; implications for the enigmatic super-conductivity of this compound are also discussed.