Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 4: Schwere Fermionen, Kondo-Systeme

TT 4.2: Vortrag

Montag, 24. März 2003, 15:00–15:15, HSZ03

Hall effect in moderately disordered Uranium Heavy Fermion compounds — •S. Süllow¹, I. Maksimov¹, F.J. Litterst¹, and J.A. Mydosh² — ¹IMNF, TU Braunschweig, 38106 Braunschweig — ²KOL, Leiden University, 2300 RA Leiden, Niederlande

We present Hall effect experiments on the moderately disordered Uranium heavy fermion compounds UPd_2−xSn and URh₂Ge_2−xSn_x. The electronic transport properties of these materials are characterized by fairly large values of the resistivity ρ and a non–metallic temperature dependence d ρ/d T < 0. For all materials we observe metallic carrier concentrations. Therefore, the non–metallic resistivity is a consequence of the crystallographic disorder. Further, we demonstrate that the anomalous Hall contribution, in contrast to common heavy fermion systems, does not arise from Skew scattering, i.e., the coefficient of the anomalous Hall effect R_S is not proportional to the product of susceptibility χ and resistivity ρ_mag. We discuss alternative models to account for the anomalous Hall effect in these materials.
Work supported by the DFG under contract no. SU229/1-1.