Kondo resonance in a magnetically ordered compound Ce₂RhSi₃: photoemission spectroscopy and ab initio band structure calculations

Abstract

We study the electronic structure of an antiferromagnetic metal, Ce₂RhSi₃ (T_N < 7 K), using high-resolution photoemission spectroscopy and ab initio band structure calculations. The valence-band spectra at higher binding energies are well described within the local-density approximations. The high-resolution spectra near Fermi level reveals the emergence of the Kondo resonance features with the decrease in temperature, which are distinctly different from the features appearing due to magnetic Ce 4f contributions. These results provide a direct evidence that the Kondo compensation effect of the local moments persists in this magnetically ordered compound, thereby, supporting the validity of the ideas based on spin-density-wave state as quantum criticality is approached.