Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.24: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Development of the magnetic order in Yb(Rh_1−xCo_x)₂Si₂ — •Christoph Klingner, Cornelius Krellner, Tanja Westerkamp, Niels Oeschler, Manuel Brando, Christoph Geibel, and Frank Steglich — Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

In recent years YbRh₂Si₂ has been intensively investigated due to its proximity to an antiferromagnetic quantum critical point (QCP). As expected for Yb-Kondo lattice compounds the magnetic ordering of YbRh₂Si₂ (T_N=70mK) can be shifted to higher temperature by applying pressure. Doping with Cobalt results in positive chemical pressure, allowing therefore the investigation of the magnetic phase diagram and the behavior while stabilizing the antiferromagnetic ordered state. The advantage of less complex measurements compared to high pressure experiments leads to more detailed and precise results than in pressure studies. In this contribution we report on the growth of a series of single crystals Yb(Rh_1−xCo_x)₂Si₂ with concentrations x between 0 and 1. The low temperature properties studied by resistivity, specific heat and magnetization measurements for different concentrations will be presented. Further on the behaviour of the transitions under an applied magnetic field will be discussed. Finally, a phase diagram of Yb(Rh_1−xCo_x)₂Si₂ will be presented and compared with the pressure phase diagram of YbRh₂Si₂.