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2014 | 126 | 4a | A-144-A-148
Article title

Valence Band of Ce_2Co_{0.8}Si_{3.2} and Ce_2RhSi_3 Studied by Resonant Photoemission Spectroscopy and FPLO Calculations

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Abstracts
EN
This work presents studies of the valence band of two Kondo lattice systems: Ce_2Co_{0.8}Si_{3.2}, which is paramagnetic with the Kondo temperature T_{K} ≈50 K and Ce_2RhSi_3, which is antiferromagnetic below T_{N}=4.5 K and exhibits T_{K} ≈9 K. The photoemission spectra, which are obtained with photon energy tuned to Ce 4d-4f resonance, reveal a Kondo peak at the Fermi energy (E_{F}), its spin-orbit splitting partner at 0.24 eV and a broad maximum related to Ce f^0 final state. The spectra indicate that Kondo peak has a higher intensity for Ce_2Co_{0.8}Si_{3.2}. The off-resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards E_{F} for Ce_2Co_{0.8}Si_{3.2} as compared to Ce_2RhSi_3. Full-potential local-orbital calculations were realized with local spin density approach +U approach for 213 stoichiometry. They show that a higher density of states near E_{F} is observed for Ce_2CoSi_3. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of Ce_2RhSi_3 and Ce_2CoSi_3, respectively.
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Contributors
author
  • M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
author
  • M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
author
  • Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
author
  • M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
  • Depto. de Fisica de la Materia Condensada, Universidad Autónoma de Madrid, Madrid, Spain
author
  • M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
author
  • MAX-Lab, Lund University, 221 00 Lund, Sweden
author
  • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland
  • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland
author
  • M. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv126n4a34kz
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