Revealing the orbital composition of heavy fermion quasiparticles in CeRu$_2$Si$_2$
Résumé
We present a resonant angle-resolved photoemission spectroscopy (ARPES) study of the electronic band structure and heavy fermion quasiparticles in CeRu$_2$Si$_2$. Using light polarization analysis, considerations of the crystal field environment and hybridization between conduction and $f$ electronic states, we identify the $d$-electronic orbital character of conduction bands crossing the Fermi level. Resonant ARPES spectra suggest that the localized Ce $f$ states hybridize with $e_g$ and $t_{2g}$ states around the zone center. In this fashion, we reveal the orbital structure of the heavy fermion quasiparticles in CeRu$_2$Si$_2$ and discuss its implications for metamagnetism and superconductivity in the related compoundCeCu$_2$Si$_2$.
Domaines
Physique [physics]| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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