Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Heavy Fermions
TT 17.1: Vortrag
Mittwoch, 28. März 2007, 14:00–14:15, H18
Antiferromagnetic groundstate in CeCu2(Si0.55Ge0.45)2 with broken body center — •Enrico Faulhaber1, Oliver Stockert2, Astrid Schneidewind1,3, Micha Deppe2, Christoph Geibel2, Frank Steglich2, and Michael Loewenhaupt1 — 1TU Dresden; Institut für Festkörperphysik; Zellescher Weg 16; D-01062 Dresden — 2Max-Planck-Institut CPfS; Nöthnitzer Str. 40; D-01187 Dresden — 3Forschungsneutronenquelle Heinz Meier-Leibnitz; D-85747 Garching
The heavy fermion system CeCu2(Si1−xGex)2 allows to study the interplay between antiferromagnetism and superconductivity (for x≤ 0.1). CeCu2(Si0.55Ge0.45)2 is especially interesting, since its characteristic temperatures which are easier accessible than in CeCu2Si2, and the value of the ordered magnetic moment (µCe≈ 0.5 µB) [1] qualify it as a reference system for the magnetic structures within the system.
Recently, we performed an elastic neutron scattering experiment on the PANDA triple-axis-spectrometer at the FRM-II, tuned for high q resolution.
Additional satellite peaks were observed below TL≈ 1.4± 0.1 K <TN≈ 3.1 K consistent with the same incommensurate propagation vector τ = (0.27 0.27 0.51) found above TL, but corresponding to a broken symmetry of the body centred ThCr2Si2 structure (I4/mmm) and, therefore, a reduced Brillouin zone.
Our findings can be modelled with two magnetic sublattices formed by counterrotating cycloids.
The results will be discussed in comparison to previous measurements.
E. Faulhaber et al., J. Magn. Magn. Mater. 272 (2004) 44.