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Berlin 2005 – scientific programme

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MA: Magnetismus

MA 25: Kondo/Schwere-Fermionen

MA 25.2: Talk

Tuesday, March 8, 2005, 12:45–13:00, TU A060

Electronic transport properties of single crystalline UPt2Si2 — •A. Otop1, R.W.A. Hendrikx2, J.A. Mydosh2,3, and S. Süllow11IMNF, TU Braunschweig, Germany — 2Kamerlingh Onnnes Laboratory, Leiden University, The Netherlands — 3Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany

We present a detailed study of the transport properties of single crystalline tetragonal UPt2Si2, for which we recently established the presence of crystallographic disorder on the Pt/Si sublattice. We carried out resistivity (ρ), magnetoresistrivity (MR) and Hall effect measurements (RH) in the temperature range from 2 to 300 K and in magnetic fields up to 5.5 T. In this range we observe a very pronounced anisotropy between a and c axis behavior. While along the a axis we find a common heavy fermion metallic resistivity, along the c axis ρ is disorder dominated. From our MR data we extract the magnetic scattering component of the electronic transport properties. With our Hall effect data we establish the metallicity for both crystallographic axes of our material. We discuss the relevance of the crystallographic disorder for the transport properties for this correlated electron material.

This work was supported by the DFG under Contract No. SU229/1-3.

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