Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Heavy Fermions
TT 54.3: Vortrag
Mittwoch, 2. April 2014, 10:00–10:15, HSZ 204
Surface Properties of Rare Earth Hexaborides Studied by X-Ray Spectroscopy — •Nadine Heming1, Uwe Treske1, Dmytro S. Inosov2, 3, Martin Knupfer1, Bernd Büchner1, Natalya Yu. Shitsevalova4, Volodymyr B. Filipov4, Emile Rienks5, and Andreas Koitzsch1 — 1IFW Dresden — 2TU Dresden — 3MPI Stuttgart — 4Frantsevich Inst. Kiev — 5HZB, Berlin
Rare earth hexaborides (RB6) are a group of materials that have unique crystal structures but a striking variety of physical properties. SmB6, for example, is a mixed valence heavy fermion compound and well known for its anomalous low temperature resistivity behavior. Transport experiments have evidenced, that its unusual residual conductivity occurs only at the surface, making this compound the prime candidate for the proposed new material class of "Topological Kondo Insulators". However, it is known for decades that the surface undergoes valence changes and reconstructions, which may influence the properties of the material and could even form the basis of alternative scenarios. Here we use x-ray spectroscopy (XPS, XAS) to explicitly study surface properties of SmB6 and CeB6. The heavy fermion compound CeB6 is known for many years for its unusual magnetic properties at low temperatures, in particular the elusive antiferro-quadrupolar ordering at TQ = 3.2 K. To study its electronic structure surface sensitive techniques such as ARPES and STM are in order, which benefit from deeper knowledge of the surface properties as well.