Spin-wave dispersion in the itinerant helimagnet FeP
FeP is a very unusual itinerant helimagnet, in which the spin spiral derives from a ferrimagnetic arrangement of spins ("double helix" structure). There are two magnetic sublattice with a different size of the magnetic moment, which are twisted into a helical spiral propagating along the orthorhombic c axis. As a consequence, two inequivalent pairs of incommensurate magnetic Bragg peaks (with associated helimagnon modes) form near the allowed and forbidden structural Bragg peaks (101) and (110), respectively. We performed overview TOF measurements that show rather sharp magnon modes at both positions, well localized in Q space. However, the signal intensity was insufficient to clearly see the details of the dispersion. Here we would like to use the high-flux spectrometer IN8 to follow the dispersion of these magnon branches in the thermal-neutron energy range.
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Dmytro Inosov; CAMERON Alistair; IVANOV Alexandre; KULBAKOV Anton; ONYKIIENKO Yevhen; SUKHANOV Aleksandr and Yuliia Tymoshenko. (2019). Spin-wave dispersion in the itinerant helimagnet FeP. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1599
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