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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.14: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Magnetism and valence fluctuations in Eu(Rh_1−xIr_x)₂Si₂ single crystals — •Silvia Seiro and Christoph Geibel — MPI-CPfS, Nöthnitzer Strasse 40, 01187 Dresden, Germany

Valence instabilities and intermediate valence in rare earth intermetallics RT₂Si₂, R being a rare earth element with instable 4f-shell like Ce, Eu and Yb, and T a transition metal, have been focus of research for the last three decades. In particular, much attention has been drawn by the suppression of the magnetic order of the localized f moments and the associated transition from a small to a large Fermi surface, which can be induced in Ce and Yb compounds by varying some external parameter such as pressure, composition or magnetic field. Due to the unavailability of high quality single crystals, however, the properties of homologue Eu compounds remain comparatively unexplored. We report the synthesis of Eu(Rh_1−xIr_x)₂Si₂ single crystals and their physical properties as they evolve from divalent Eu antiferromagnetism for x=0 to intermediate valence behavior for x=1.