Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.12: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Magnetic anisotropy of flux-grown of CeAu₂Ge₂ — •Veronika Fritsch¹, Gerda Fischer¹, Peter Pfundstein², Bernd Pilawa^1,3, and Hilbert v. Löhneysen^1,3 — ¹Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe, Germany — ²Karlsruher Institut für Technologie, Laboratorium für Elektronenmikroskopie, 76131 Karlsruhe, Germany — ³Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76131 Karlsruhe, Germany

CeAu₂Ge₂ crystallizes in the well-known tetragonal ThCr₂Si₂ structure. Although the high anisotropy of this crystal structure is often reflected in its magnetic properties, most previous investigations were performed on polycrystals. We succeeded in the growth of CeAu₂Ge₂ single crystals in Au-Ge flux as well as in Sn flux. X-ray powder diffraction measurements and EDXS measurements indicate that in the latter case Sn atoms from the flux are incorporated in the samples. We present measurements of the magnetization M demonstrating a strong dependence of the magnetic properties on the flux employed: M(B) curves with the field B aligned along the easy axis in the temperature regime of magnetic order (T_N = 14.4 K) reveal with decreasing temperature an increasing number of metamagnetic-like transitions in the Au-Ge-flux grown sample, but only a single one (with increasing field) or two (with decreasing field) metamagnetic-like transitions in the Sn-flux grown sample. With the magnetic field aligned along the hard axis no indication of magnetic order is found in the M(T) curves for small B, where the M(T) curves for the easy axis show a sharp maximum.