Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: CE: Heavy Fermions
TT 26.16: Vortrag
Mittwoch, 24. März 2010, 18:15–18:30, H21
Charge Fluctuations and the Valence Transition in Yb under Pressure — Erik R. Ylvisaker1, •Jan Kuneš2, Andrew K. McMahan3, and Warren E. Pickett1 — 1Department of Physics, University of California, Davis, California, USA — 2Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg, Germany — 3Lawrence Livermore National Laboratory, Livermore, California, USA
Materials, whose atomic state cannot be approximated by a single Slater determinant, are said to have fluctuating or intermediate valence. Using dynamical mean-field theory we investigate the physics of elemental Yb, which exhibits a valence transition under pressure accompanied by a crossover from the fluctuating to the intermediate valence behavior. By comparison to other rare-earth materials (Ce, Nd, Pr) we show that fluctuating and intermediate valence regimes can be distinguished by the charge susceptibility. A large charge susceptibility can explain the softness of Yb in the valence transition region.