Dresden 2003 – scientific programme
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TT: Tiefe Temperaturen
TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)
TT 14.35: Poster
Wednesday, March 26, 2003, 14:30–19:00, P2c
Magnetic order in CeCu2(Si0.5Ge0.5)2 studied with magnetic neutron and X-ray scattering — •O. Stockert1, M. Deppe1, C. Detlefs2, E. Faulhaber3, C. Geibel1, A. Hiess4, D. Hohlwein5, A. Kreyßig3, M. Loewenhaupt3, M. Rheinstädter4, R. Schneider5, A. Schneidewind1, and F. Steglich1 — 1Max-Planck-Institut CPfS, Nöthnitzer Straße 40, D-01187 Dresden — 2European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France — 3TU Dresden, Institut für Angewandte Physik (IAPD), D-01062 Dresden — 4Institut Laue-Langevin, BP 156, F-38042 Grenoble, France — 5Hahn-Meitner-Institut, Glienicker Straße 100, D-14109 Berlin
The heavy-fermion system CeCu2(Si1−xGex)2 can easily be tuned via alloying from antiferromagnetically ordered CeCu2Ge2 to the heavy-fermion superconductor CeCu2Si2. The x=0.5 alloy is particulary interesting because it exhibits several phase transistions below the Néel temperature TN ≈ 3.1 K. In order to determine the magnetic structure and the origin of the different magnetically ordered phases magnetic neutron and X-ray scattering experiments have been performed on the same single crystal at HMI Berlin, ILL Grenoble and ESRF Grenoble.
CeCu2(Si0.5Ge0.5)2 orders in an incommensurate magnetic structure with a propagation vector τ ≈ (0.275 0.275 0.51) determined by the nesting of the Fermi surface. Two phase transitions within the ordered state can be attributed to a spin reorientation and a lock-in of the magnetic structure. Resonant magnetic X-ray scattering allows to extract information about the moment direction not accessible by neutron diffraction. A model for the magnetic structure will be presented.