| Magnetic ground state and electronic structure of CeRu(2)Al(10). | |
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MedLine Citation:
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PMID: 22329993 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We present a combined theoretical and experimental study of the electronic structure for CeRu(2)Al(10) based on ab initio band structure calculations and x-ray photoemission spectroscopy (XPS) data. Our calculations were performed for the base unit cell and for the hypothetical unit cell which enables antiferromagnetic ordering. The stability of the magnetic phase was investigated within fixed spin moment calculations. When additional 4f correlations are not included in the LSDA + U approach, CeRu(2)Al(10) exhibits an unstable magnetic configuration with the difference in total energy per unit cell between the weakly magnetic state and the non-magnetic one of the order ∼0.3 meV. We found that Coulomb correlations among 4f electrons, when they are included in the LSDA + U approach, stabilize the magnetic structure. In the weakly correlated system (small U) an antiferromagnetic (AFM) ground state with the lowest total energy is preferred. The situation is, however, the opposite when the 4f correlations are strong. In this case the ferromagnetic (FM) ground state is preferred. By comparing our calculations with the experimental data we conclude that the 4f correlations in CeRu(2)Al(10) are weak. We also carried out a structural relaxation of atomic positions within the Cmcm unit cell and we found that the Al atoms exhibit noticeable displacement from their positions known from x-ray diffraction (XRD) analysis. |
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Authors:
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Jerzy Goraus; Andrzej Slebarski |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-2-13 |
Journal Detail:
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Title: Journal of physics. Condensed matter : an Institute of Physics journal Volume: 24 ISSN: 1361-648X ISO Abbreviation: - Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-2-14 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101165248 Medline TA: J Phys Condens Matter Country: - |
Other Details:
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Languages: ENG Pagination: 095503 Citation Subset: - |
Affiliation:
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Institute of Physics, University of Silesia, 40-007 Katowice, Poland. |
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