Total interference between nuclear and magnetovibrational one-phonon scattering cross sections

Raymond, S.; Schmalzl, K.; Brückel, T.; Biniskos, N.; Persson, J.

doi:10.1088/1742-6596/1316/1/012018

Journal Article

FZJ-2020-00083

Total interference between nuclear and magnetovibrational one-phonon scattering cross sections

Raymond, S. ; Biniskos, N. (Corresponding author) ; Schmalzl, K.FZJ* ; Persson, J.FZJ* ; Brückel, T.FZJ*

2019
IOP Publ. Bristol

Journal of physics / Conference Series 1316(1), (2019) [10.1088/1742-6596/1316/1/012018]

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Please use a persistent id in citations: http://hdl.handle.net/2128/23808 doi:10.1088/1742-6596/1316/1/012018

Abstract: A full phonon intensity cancellation is reported in a longitudinal polarized inelastic neutron scattering experiment performed on the magnetocaloric compound MnFe4Si3, a ferromagnet with TCurie ≈ 305 K. The TA[100] phonon polarized along the c-axis measured from the Brillouin zone center G=(0, 0, 2) is observed only in one ($\sigma _z^{ + + }$) of the two non-spin-flip polarization channels and is absent in the other one ($\sigma _z^{ - - }$) at low temperatures. This effect disappears at higher temperatures, in the vicinity of TCurie , where the phonon is measured in both channels with nonetheless marked different intensities. The effect is understood as originating from nuclear-magnetic interference between the nuclear one-phonon and the magnetovibrational one-phonon scattering cross-sections. The total cancellation reported is accidental, i.e. does not correspond to a systematic effect, as established by measurements in different Brillouin zones.

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