Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 4: CE: Quantum-Critical Phenomena 1
TT 4.7: Talk
Monday, March 14, 2011, 12:15–12:30, HSZ 201
Neutron depolarization imaging at milli-Kelvin temperatures of the Kondo-cluster-glass formation in CePd1−xRhx — •Philipp Schmakat1, Michael Schulz1,2, Christian Pfleiderer1, Peter Böni1, Elbio Calzada1,2, Sergey Masalovich2, Manuel Brando3, Christoph Geibel3, and Micha Deppe3 — 1Physik-Department E21, Technische Universität München — 2Forschungs-Neutronenquelle FRM-II, München — 3Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden
In the f-electron compound CePd1−xRhx a new groundstate entitled as Kondo-Cluster-Glass has been proposed for x>0.65 [1]. The origin of this cluster formation is assumed to be an interplay of metallurgical inhomogeneities and the effect of two competing interactions, namely the Kondo-screening and the long-range RKKY-interaction.
We have investigated the magnetic phase diagram of the Kondo-lattice CePd1−xRhx in the concentration range 0.40 ≤ x ≤ 0.80 by means of neutron depolarisation imaging (NDI) down to 75 mK. The NDI technique allowed us to map out inhomogeneities of the transition temperature and the spontaneous magnetization over the sample, as well as the average domain size. Our data are consistent with previous studies and support the picture of the cluster formation where long-range order vanishes with increasing Rh content and short-range interactions become crucial.
J.G. Sereni, Phys. Rev. B 75, 024432 (2007);
T. Westerkamp, Phys. Rev. Lett. 102, 206404 (2009).