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TT: Fachverband Tiefe Temperaturen
TT 44: Poster Session Correlated Electrons
TT 44.78: Poster
Donnerstag, 17. März 2011, 10:00–13:00, P1
Low temperature thermal and electrical transport properties of ZrZn2 in high magnetic field — •Yang Zou1,3, Mike Sutherland1, Stephen Hayden2, Daniel Rothfuß3, Andreas Fleischmann3, F. Malte Grosche1, and Christian Enss3 — 1Cavendish Laboratory, University of Cambridge, United Kingdom — 2Department of Physics, University of Bristol, United Kingdom — 3Kirchhoff-Institut, Universität Heidelberg, Germany
Laudau’s Fermi-liquid theory has been proven remarkably successful in describing the properties of metals at low temperatures. Unlike most metals, the low temperature band ferromagnet ZrZn2 appears to violate Fermi-liquid behaviour over a wider temperature range at low temperature. In order to investigate the nature of the Fermi-liquid breakdown in this material, the electrical and thermal transport properties of ZrZn2 were investigated over a wide range of magnetic field. An experimental technique to measure the thermal conductivity down to 100 mK has been set up and tested. In zero field our measurements confirm the finding reported in [1] that, to leading order in temperature T, the electrical and effective thermal resistivities at low temperature take a T5/3 and T form, respectively. These are the signatures of a marginal Fermi-liquid, predicted to occur close to a ferromagnetic quantum critical point by spin fluctuation theory. In contrast, we find that at finite magnetic field the electrical and effective thermal resistivities assume quadratic temperature dependencies, consistent with a return to conventional Fermi-liquid behaviour.
[1] Smith et al. Nature 455, 7217 (2008)