| AVS 57th International Symposium & Exhibition | |
| Actinides and Rare Earths Topical Conference | Monday Sessions |
| Session AC+SS-MoM |
| Session: | Surface Science of Actinides |
| Presenter: | T. Durakiewicz, Los Alamos National Laboratory |
| Authors: | T. Durakiewicz, Los Alamos National Laboratory J. Joyce, Los Alamos National Laboratory P.S. Riseborough, Temple University P.M. Oppeneer, Uppsala University, Sweden J.-C. Griveau, ITU, Germany E.D. Bauer, Los Alamos National Laboratory E. Guziewicz, Polish Academy of Sciences, Poland |
| Correspondent: | Click to Email |
Several mechanisms may lead to band renormalization in strongly correlated systems. Inter-band scattering was recently shown to produce significant renormalization effects in high temperature superconductors. Here we show, for the first time, that inter-band processes may lead to strong band renormalization in the vicinity of Fermi level in a 5f-electron system, USb2. The Fermi surface of this compound consists of several uniaxial cylindrical sheets. We show that the bare band LDA calculation over-counts the number of sheets, because it lacks the renormalization part. But our high resolution angle resolved photoemission (ARPES) experiments demonstrate that one of the calculated cylinders shrinks below the Fermi level, forming a closed cigar-shaped Fermi surface rather than an open cylindrical one. In normal emission experiments, we measure the dispersion of the bands of interest in the Gamma-Z direction. The measured results disagree with the LDA result, but the bare LDA bands can be renormalized by using a low order self-energy expansion in three-band inter-band scattering model, and very good fit is obtained. We conclude that inter-band scattering in USb2 influences the fermiology of this system in terms of changing the shape and number of Fermi sheets.