Berlin 2015 – wissenschaftliches Programm
TT 67.10: Vortrag
Mittwoch, 18. März 2015, 17:30–17:45, H 3005
Charge fluctuations and coherence in the mixed-valence regime investigated on Sm1−xLaxB6 — •Chul-Hee Min1, Kuang-Shing Chen2, Hendrik Bentmann1, Sebastian Fiedler1, Boyoun Kang3, Beongki Cho3, Jan Werner2, Fahker Assaad2, and Friedrich Reinert1 — 1Universität Würzburg, EP7, Würzburg, Germany — 2Universität Würzburg, TP1, Würzburg, Germany — 3School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea.
We present an investigation on the temperature dependence of 4f states and 3d core-levels in Sm1−xLaxB6 in order to identify the unique electronic properties of a mixed valence regime. By use of photon energies from VUV to hard x-rays (HAXPES), we separate surface and bulk properties, which show significant differences. Our results particularly by HAXPES indicate that charge fluctuations in SmB6 are a rather local property, which might influence the expectation value of the potential energy. A characteristic feature and the signature of the lattice coherence in a mixed valence regime will be demonstrated and discussed.