Spin-phonon coupling in FeSi
We recently reported evidence that FeSi exhibits an intrguing coupling between its magnetic and lattice degrees of freedom using inelastic neutron scattering performed at LLB, ILL and MLZ (Krannich et al., Nat. Commun. 2015)). Here we propose to investigate the behavior of phonon modes in FeSi featuring such a strong spin-phonon coupling under an applied magnetic field up to B = 10 T. The magnetic field will strenghten the (already in zero field present) magnetic fluctuations leading to a ferromagnetic-like state, for which spin-phonon coupling was calculated to be very sensitive with regard to the energies of magnetic excitations. If the scenario of a direct coupling between the magnetic and lattice degrees of freedom is correct, we expect a magnetic field dependence of the phonon life time and its linewidth in energy if we tune the magnetic properties with the field. This would be direct evidence of spin-phonon coupling and not biased by other possible, e.g., temperature dependences.
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MOERTTER Matthias; BOLL Dominic; IVANOV Alexandre; SIDIS Yvan and WEBER Frank. (2016). Spin-phonon coupling in FeSi. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-439
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