Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Correlated Electrons: Quantum-Critical Phenomena - Experiment II
TT 55.5: Vortrag
Mittwoch, 2. April 2014, 12:15–12:30, HSZ 204
Thermoelectric properties at a Quantum Phase Transition in Mn1−xFexSi — Marlies Gangl1, •Anna Kusmartseva1,2, Marco Halder1, Andreas Bauer1, and Christian Pfleiderer1 — 1Technische Universität München, Physik Department E21, Garching, Germany — 2Loughborough University, Physics Department, Loughborough, UK
MnSi is a B20 transition metal compound that has been traditionally a model system to study helical modulation in magnetism and weak itinerant ferromagnetism. In particular, the behaviour to different transition metal doping with Fe, Co as well as studies under pressure had been of vast interest to the research community.
Here we present resistivity, thermopower and thermal conductivity on high-quality Fe-doped single crystals of MnSi over a wide range in temperatures from 2 to 300K under magnetic fields up to 14T. The growth and purity of the single crystals Mn1−xFexSi was investigated previously in detail [1]. We report the appearance of Non-Fermi Liquid behaviour in the resistivity of doped Mn1-xFexSi samples and discuss how these results relate to the respective measurements of thermopower and thermal conductivity. Comparisons and parallels to studies reported under pressure are also made [2,3].
A. Bauer, A. Neubauer, C. Franz, W. Muenzer, M. Garst, and C. Pfleiderer, Phys. Rev. B, 82, 57011 (2010)
J.-G. Cheng, F. Zhou, J.-S. Zhou, and J.B. Goodenough, Phys. Rev. B, 82, 214402 (2010)
S. Arsenjevic, C. Petrovic, L. Forro, and A. Akrap, Euro. Phys. Lett., 103, 57015 (2013)