Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Electron Theory of Magnetism and Correlations

MA 38.10: Vortrag

Mittwoch, 22. März 2017, 12:00–12:15, HSZ 403

Bosonic excitations observed at the transition to helical magnetic phases in PrPtAl — •Jean-Philippe Reid1, D Sokolov2, C Oneill3, C Lithgow3, A Walker1, M Lizaire1, S Codsi1, E Yelland3, P Wahl1, and Andrew Huxley31School of Physics and Astronomy, University of St. Andrews, St. Andrews, UK — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 3School of Physics and CSEC, University of Edinburgh, Edinburgh, UK

Transport and thermodynamic measurements were performed on the rare earth platinum aluminide PrPtAl through the helical magnetic phases, located in a narrowed temperature range between the ferromagnetic and paramagnetic phases. We detected an additional bosonic contribution to the thermal conductivity which can only be related to the helical magnetic phase. This additional bosonic contribution accounts for most of the increase of the density of states observed in the specific heat. It suggests that the emergence of the helical magnetic phases is accompanied by strong bosonic fluctuations which not only induce scattering, but also contribute to the thermal conductivity. Quantum order-by-disorder theory effectively integrates over boson modes and considers fermionic quantum fluctuations. Our findings suggests direct consideration of the boson modes may provide greater insight.

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