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AGjDPG: Arbeitsgruppe junge DPG

AGjDPG 3: PhD symposium of the Magnetism Division and the AGjDPG 2015: Quantum Phase Transitions: Emergent phenomena beyond elementary excitations

AGjDPG 3.14: Poster

Tuesday, March 17, 2015, 16:15–16:30, EB 301

Transport properties across the quantum phase transitions in Mn_1−xFe_xSi — •Fabian Jerzembeck¹, Marlies Gangl¹, Anna Kusmartseva^1,2, 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 Mn_1−xFe_xSi [2] down to temperatures of ∼2 K under magnetic fields up to 14 T. These data are complemented by additional selected measurements in Mn_1−xCo_xSi. As our main objective we consider the validity of the Wiedemann-Franz law across the quantum phase transitions in Mn_1−xFe_xSi.

[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).