Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.30: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Induced magnetism in off-stoichiometric LiFeAs — •Robert Beck¹, Uwe Gräfe¹, Igor Morozov^1,2, Philipp Materne³, Giacomo Prando¹, Hans-Joachim Grafe¹, Sabine Wurmehl^1,3, and Bernd Büchner^1,3 — ¹Leibniz Institute for Solid State and Material Research, D-01171 Dresden, Germany — ²Moscow State University, Moscow, 119991 Russia — ³Institut für Festkörperphysik, TU Dresden, D-01062 Dresden, Germany

We prepared a series of polycrystalline Li_1−yFe_1+xAs samples in a wide range of nominal compositions (0 < y < 0.1 and 0 < x < 0.1). The structure, composition and main characterization physical properties were studied in detail. Seemingly, the composition strongly affects the electronic ground state of the materials, ranging from superconductivity to bulk ferromagnetism. Concomitantly with the evolution of different ordering parameters as function of composition, we observe systematic trends in both line width and frequency of nuclear quadrupole resonance lines.