Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 67: Correlated Electrons: f-Electron Systems

TT 67.10: Talk

Wednesday, March 18, 2015, 17:30–17:45, H 3005

Charge fluctuations and coherence in the mixed-valence regime investigated on Sm_1−xLa_xB₆ — •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 Sm_1−xLa_xB₆ 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.