Magnetic interactions underpinning the Skyrmion- and Hedgehog-lattice phases in centrosymmetric SrFeO3
SrFeO3 is one of only two known centrosymmetric compounds to host a Skyrmion-lattice phase, and the only centrosymmetric material known to host a three-dimensional hedgehog-lattice phase. Their unique helical propagation vectors make these the only two compounds in which the structure of helimagnetic excitations of a multiple-q structure can in principle be resolved. Studying the Gd material with neutrons would require ~20g of isotopically-enriched Gd metal, which would cost ~200 000 EUR¿, so in practice only SrFeO3 is accessible. The mechanism stabilizing these exotic multi-q phases is not known, and the required spin-wave theory has not been developed. Determining how such phases can arise in a centrosymmetric material will require characterizing the underlying exchange interactions, which are most directly accessible through neutron scattering, together with ongoing theoretical work (in an existing close collaboration). We intend to measure the excitation spectra in all low-field magnetically-ordered phases in SrFeO3, to determine these parameters and how they change among the phases, and to provide vital feedback for the theory.
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Darren C. Peets; Dmytro Inosov; KULBAKOV Anton; OLLIVIER Jacques; ONYKIIENKO Yevhen and Yuliia Tymoshenko. (2021). Magnetic interactions underpinning the Skyrmion- and Hedgehog-lattice phases in centrosymmetric SrFeO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1720
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