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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.13: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Magnetic excitations in CeCu2Ge2 — •Astrid Schneidewind1, Oliver Stockert2, Karin Schmalzl3, Micha Deppe2, Julia Arndt2, Christoph Geibel2, Frank Steglich2, and Michael Loewenhaupt11Inst. f. Festkörperphysik, TU Dresden, D-01062 Dresden, Germany — 2Max-Planck-Institut-CPfS, D-01178 Dresden, Germany — 3Jülich Centre of Neutron Science, D-52425 Jülich, Germany, and Institut Laue-Langevin, F-38042 Grenoble, France

CeCu2Ge2 is a heavy-fermion compound showing incommensurate antiferromagnetic order with Kondo-compensated moments below TN = 4.15 K [1,2]. Calculations of the Fermi surface show that a local character of the Ce 4f moments is not able to explain the incommensurate nesting vector as observed [3]. Involving an also itinerant component of the Ce 4f moments results in a nesting vector q which agrees well with the experimental values of q [3]. Since magnetic excitations are sensitive on the localization of the magnetic moments, we started to study the magnetic excitation spectrum to understand the magnetic order in CeCu2Ge2. In a first neutron scattering experiment on a CeCu2Ge2 single crystal the magnetic propagation vector was confirmed to be incommensurate and temperature dependent as reported by Krimmel et al. [2]. Furthermore, magnetic excitations have clearly been detected at low energies (ℏω ≤ 2 meV) below TN displaying different temperature and q-dependences.

[1] A. Krimmel et al., Physica B 234-236 (1997) 877.

[2] A. Krimmel et al., Phys. Rev. B 55 (1997) 6416.

[3] G. Zwicknagl, J. of Low Temp. Phys. 147 (2007) 123.

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