Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 35: PhD Symposium: Quantum Phase Transitions: Emergent Phenomena beyond Elementary Excitations (organized by MA, jDPG)
TT 35.14: Poster
Dienstag, 17. März 2015, 16:15–16:30, EB 301
Transport properties across the quantum phase transitions in Mn1−xFexSi — •Fabian Jerzembeck1, Marlies Gangl1, Anna Kusmartseva1,2, Andreas Bauer1, and Christian Pfleiderer1 — 1Physik Department, Technische Universität München, D-85747 Garching, Germany — 2Department of Physics, Loughborough University, UK-LE11 3TU Leicestershire, United Kingdom
Recent theory identify the thermal and electrical transport properties as a sensitive probe of the validity of the Fermi liquid description of the metallic state [1]. A prime example for a well understood, weakly spin-polarized Fermi liquid ground state has long been established in the weak itinerant helimagnet MnSi. We report a detailed study of the evolution of the thermal and electrical transport properties across the quantum phase transitions in Mn1−xFexSi [2] down to temperatures of ∼2 K under magnetic fields up to 14 T. These data are complemented by additional selected measurements in Mn1−xCoxSi. As our main objective we consider the validity of the Wiedemann-Franz law across the quantum phase transitions in Mn1−xFexSi.
[1] R. Mahajan, M. Berkeshli, S. A. Hartnoll, Phys. Rev. B 88, 125107 (2013). [2] A. Bauer et al., Phys. Rev. B 82, 064404 (2010).