2017/05/08 by Alexander Generalov, A. Generalov, D. A. Sokolov +14 · 10 citations
Materials Science · Physics and Astronomy · #Anderson impurity model #Condensed matter physics #Electrical resistivity and conductivity #Fermi level #Ferromagnetism #Impurity #Iron-based superconductors research #Kondo effect #Lattice (music) #Magnetic Properties of Alloys #Materials science #Physics #Quantum mechanics #Rare-earth and actinide compounds #Spectral line #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.95.184433
published in Physical review. B./Physical review. B 95(18) (American Physical Society) · Accepted to Phys. Rev. B
arxiv created 2017/05/08 · openalex publication_date 2017/05/30 · arxiv updated 2017/06/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Analyzing temperature dependent photoemission (PE) data of the ferromagnetic Kondo-lattice (KL) system YbNiSn in the light of the periodic Anderson model (PAM) we show that the KL behavior is not limited to temperatures below a temperature TK, defined empirically from resistivity and specific heat measurements. As characteristic for weakly hybridized Ce and Yb systems, the PE spectra reveal a 4f-derived Fermi level peak, which reflects contributions from the Kondo resonance and its crystal electric field (CEF) satellites. In YbNiSn this peak has an unusual temperature dependence: With decreasing temperature a steady linear increase of intensity is observed which extends over a large interval ranging from 100 K down to 1 K without showing any peculiarities in the region of TK\ensuremath∼TC=5.6 K. In the light of the single-impurity Anderson model (SIAM) this intensity variation reflects a linear increase of 4f occupancy with decreasing temperature, indicating an onset of Kondo screening at temperatures above 100 K. Within the PAM this phenomenon could be described by a non-Fermi-liquid-like T- linear damping of the self-energy which accounts phenomenologically for the feedback from the closely spaced CEF states.