This title appears in the Scientific Report : 2019

Total interference between nuclear and magnetovibrational one-phonon scattering cross sections
Personal Name(s): Raymond, S. Biniskos, N. (Corresponding author) / / / Streumethoden; JCNS-2 JCNS-ILL; JCNS-ILL JARA-FIT; JARA-FIT Streumethoden; PGI-4 Journal of physics / Conference Series, 1316 (2019) 1, Bristol IOP Publ. 2019 10.1088/1742-6596/1316/1/012018 Journal Article Jülich Centre for Neutron Research (JCNS) Materials and Processes for Energy and Transport Technologies Quantum Condensed Matter: Magnetism, Superconductivity Controlling Collective States Controlling Collective States OpenAccess OpenAccess Publikationsportal JuSER
Please use the identifier: http://hdl.handle.net/2128/23808 in citations.
Please use the identifier: http://dx.doi.org/10.1088/1742-6596/1316/1/012018 in citations.
 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 â 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.