Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 78: Correlated Electrons: Poster Session

TT 78.41: Poster

Donnerstag, 10. März 2016, 15:00–18:30, Poster D

Phonons in the helimagnet MnSi — •Matthias Mörtter, Frank Weber, and Daniel Lamago — Karlsruher Institut für Technologie, Institut für Festkörperphysik, Deutschland

The interactions of electronic, spin, and lattice degrees of freedom in solids result in complex phase diagrams, new emergent phenomena, and technical applications. Recently, it was shown by detailed inelastic neutron scattering measurements and ab-initio calculations that the phonon renormalization in non-centrosymmetric FeSi is intimately linked to its unconventional magnetic properties [1]. In the current study, we investigated the isostructural helimagnet MnSi over a large temperature range, 4 K ≤ T ≤ 500 K, using thermal inelastic neutron scattering. Focusing on wave vectors with clear phonon selection rules, we report phonons energies, line widths and intensities and compare them to the magnetic properties of MnSi.

[1] S. Krannich et al., Nature Comm. 6, 9961 (2015).