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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.12: Poster

Wednesday, March 24, 2010, 14:00–18:00, Poster D1

Magnetic anisotropy of flux-grown of CeAu2Ge2 — •Veronika Fritsch1, Gerda Fischer1, Peter Pfundstein2, Bernd Pilawa1,3, and Hilbert v. Löhneysen1,31Karlsruher 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 (TN = 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.

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