Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 45: Correlated Electrons: Poster Session
TT 45.1: Poster
Donnerstag, 29. März 2012, 15:00–19:00, Poster B
High-field magnetotransport study of YbRh2Si2 — •Naren HR1, Sven Friedemann2, Cornelius Krellner1, Christoph Geibel1, Frank Steglich1, and Steffen Wirth1 — 1Max Planck Institute for Chemical Physics of Solids, Noethnitzer Str. 40, 01187 Dresden, Germany — 2Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 OHE, United Kingdom
Heavy fermion behavior is expected to be suppressed at magnetic fields high enough such that the Zeeman and the Kondo energy scales become comparable. In the prototypical heavy fermion compound YbRh2Si2, this scale is estimated to be around 10 T where anomalies have been observed in several thermodynamic quantities [1]. With a focus on this issue we present high-field (upto 15 T) magnetoresistance and Hall effect measurements on YbRh2Si2 down to 50 mK. We study the temperature evolution of the anomalies observed in our magnetotransport measurements. These features can be favourably compared to those seen in thermopower data [2]. Our measurements shed light on whether the localisation of f-electrons at such fields is accompanied by topological transformations of the Fermi surface as speculated in the iso-structural heavy fermion metamagnet CeRu2Si2 [3,4].
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