http://hdl.handle.net/20.500.12128/8120
Title: | Valence band of Ce2Co0.8Si3.2 and Ce2RhSi3 studied by resonant photoemission spectroscopy and FPLO calculations |
Authors: | Starowicz, P. Kurleto, R. Goraus, Jerzy Walczak, L. Penc, B. Adell, J. Szlawska, M. Kaczorowski, D. Szytula, A. |
Keywords: | systemy elektronowe; ciężkie fermiony; metale ziem rzadkich; stopy; struktura elektroniczna; spektroskopia |
Issue Date: | 2014 |
Citation: | Acta Physica Polonica A, Vol. 126, nr 4A (2014), s. A144-A147 |
Abstract: | This work presents studies of the valence band of two Kondo lattice systems: Ce2Co0:8Si3:2, which is paramagnetic with the Kondo temperature TK 50 K and Ce2RhSi3, which is antiferromagnetic below TN = 4:5 K and exhibits TK 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 (EF), its spin orbit splitting partner at 0.24 eV and a broad maximum related to Ce f0 nal state. The spectra indicate that Kondo peak has a higher intensity for Ce2Co0:8Si3:2. The o -resonance photoemission data reveal that a maximum in the 3d electron density of states is shifted towards EF for Ce2Co0:8Si3:2 as compared to Ce2RhSi3. 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 EF is observed for Ce2CoSi3. The calculations also reveal the existing tendencies for antiferromagnetic and ferromagnetic ground states in a case of Ce2RhSi3 and Ce2CoSi3, respectively. |
URI: | http://hdl.handle.net/20.500.12128/8120 |
DOI: | 10.12693/APhysPolA.126.A-144 |
ISSN: | 0587-4246 |
Appears in Collections: | Artykuły (WNŚiT) |
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Starowicz_Valence_band.pdf | 813,58 kB | Adobe PDF | View/Open |
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