A "hidden" transition in heavy fermion compound CeB${}_6$ at $T\sim$ 20 K?

Abstract

The temperature-dependent electronic structures of heavy fermion compound CeB${}_6$ are investigated thoroughly by means of the combination of density functional theory and single-site dynamical mean-field theory. The band structure, density of states, and 4$f$ valence state fluctuation of CeB${}_6$ are calculated in a broad temperature range of 10 $\sim$ 120 K. Overall, the 4$f$ electrons remain incoherent, approximately irrespective of the temperature. However, we find that these observables exhibit some unusual features near 20 K. In addition, the evolution of 4$f$ orbital occupancy, total angular momentum, and total energy with respect to temperature shows apparent singularity around 20 K. We believe that these tantalizing characteristics are probably related to a "hidden" electronic transition.

7 pages, 6 figures

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• Protracted Kondo screening and kagome bands in heavy-fermion metal Ce${}_3$Al
• Revealing the nature of antiferro-quadrupolar ordering in Cerium Hexaboride: CeB${}_6$
• Derivation of RKKY Interaction between Multipole Moments in CeB${}_6$ by the Effective Wannier Model based on the Bandstructure Calculation
• Unraveling the 4f electronic structures of cerium monopnictides
• Raman spectroscopy of $f$-electron metals: an example of CeB${}_6$
• Itinerant-localized crossover and orbital dependent correlations for 4$f$ electrons in cerium-based ternary 122 compounds
• Exploring the exotic f states of prototype compounds CeSb and USb