Electronic States of UNi_2 from Photoemission Spectroscopy

• Authors: R. Zalecki , A. Kołodziejczyk , N. Kim-Ngan , A. Adamska , A. Kowalczyk , T. Toliński , M. Mihalik
• Languages of publication: EN

Abstracts

EN

We measured the angle-resolved ultraviolet and X-ray photoemission spectra of UNi_2 single crystal. The valence band angle-resolved ultraviolet photoemission spectra were compared to the accessible band structure calculations. For UNi_2 the lowest binding energy strong emission at about -0.1 eV comes from U 5f states and overlaps with the Fermi edge. A small feature at -0.6 eV was ascribed also to U 5f electrons with more localised character. The higher-energy two-peak structure at about -1.2 eV and -2.1 eV comes from Ni 3d states. X-ray photoemission spectroscopy shows the standard two-line spin-orbit splitting of the Ni 2p states and of the U 4f states. Some hybridisation of the Ni 3d and U 5f state was observed in the spectra. The pronounced satellites to the Ni 2p and 3p states, associated with the on-site Coulomb repulsion and other electron correlation energies, were observed.

Keywords

EN

71.20.Lp; 79.60.Bm; 71.15.Ap

Discipline

• 71.15.Ap: Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)
• 71.20.Lp: Intermetallic compounds
• 79.60.Bm: Clean metal, semiconductor, and insulator surfaces

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 407-412

Dates

published

2008-01

received

2007-07-09

Contributors

author

R. Zalecki

• Department of Solid State Physics, AGH University of Science and Technology, 30-059 Cracow, Poland

author

A. Kołodziejczyk

• Department of Solid State Physics, AGH University of Science and Technology, 30-059 Cracow, Poland

author

N. Kim-Ngan

• Institute of Physics, Pedagogical University, 30-084 Cracow, Poland

author

A. Adamska

• Institute of Physics, Pedagogical University, 30-084 Cracow, Poland

author

A. Kowalczyk

• Institute of Molecular Physics, PAS, 60-179 Poznań, Poland

author

T. Toliński

• Institute of Molecular Physics, PAS, 60-179 Poznań, Poland

author

M. Mihalik

• Institute of Experimental Physics, SAS, 040 01 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.113.407