Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.32: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Magnetic anisotropy of the Kondo lattice CePd_1−xRh_x probed with polarized neutrons — •Philipp Schmakat^1,2, Michael Schulz², Vladimir Hutanu^2,3, Manuel Brando⁴, Christoph Geibel⁴, Micha Deppe⁴, Christian Pfleiderer¹, and Peter Böni¹ — ¹Physik-Department E21, Technische Universität München — ²Forschungs-Neutronenquelle FRM II, München — ³RWTH Aachen, Institut für Kristallographie — ⁴Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden

We have investigated the magnetic anisotropy of the Kondo lattice system CePd_1−xRh_x at low temperatures by using polarized neutrons at the instrument POLI-HEIDI where the polarization analysis device CryoPad has been installed recently. The system CePd_1−xRh_x shows significant anisotropy for low Rh concentrations x<0.6. With increasing Rh concentration a ferromagnetic quantum phase transition takes place and the anisotropy reduces. The curvature of the phase boundary T_C(x) changes sign at Rh concentration x=0.65 and a cluster glass phase emerges. Our data are consistent with previous measurements of the magnetisation. The measured polarization matrices will allow us to quantify the average domain size in each direction of space and give us important hints of magnetic stray fields of the sample induced even in zero external magnetic field.
J.G. Sereni, Phys. Rev. B 75, 024432 (2007).
T. Westerkamp, Phys. Rev. Lett. 102, 206404 (2009).