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Magnon spectrum of the helimagnetic insulator Cu2OSeO3
Complex low-temperature-ordered states in chiral magnets are typically governed by a competition between multiple magnetic interactions. The chiral-lattice multiferroic Cu2OSeO3 became the first insulating helimagnetic material in which a long-range order of topologically stable spin vortices known as skyrmions was established. Here we employ state-of-the-art inelastic neutron scattering to comprehend the full three-dimensional spin-excitation spectrum of Cu2OSeO3 over a broad range of energies. Distinct types of high- and low-energy dispersive magnon modes separated by an extensive energy gap are observed in excellent agreement with the previously suggested microscopic theory based on a model of entangled Cu4 tetrahedra. The comparison of our neutron spectroscopy data with model spin-dynamical calculations based on these theoretical proposals enables an accurate quantitative verification of the fundamental magnetic interactions in Cu2OSeO3 that are essential for understanding its abundant low-temperature magnetically ordered phases
Incommensurate magnet iron monophosphide FeP Crystal growth and characterization
We report an optimized chemical vapor transport method, which allows growing
FeP single crystals up to 500 mg in mass and 80 in volume. The high
quality of the crystals obtained by this method was confirmed by means of EDX,
high-resolution TEM, low-temperature single crystal XRD and neutron diffraction
experiments. We investigated the transport and magnetic properties of the
single crystals and calculated the electronic band structure of FeP. We show
both theoretically and experimentally, that the ground state of FeP is
metallic. The examination of the magnetic data reveals antiferromagnetic order
below T =119 K while transport remains metallic in both the paramagnetic
and the antiferromagnetic phase. The analysis of the neutron diffraction data
shows an incommensurate magnetic structure with the propagation vector Q=(0, 0,
), where 0.2. For the full understanding of the
magnetic state, further experiments are needed. The successful growth of large
high-quality single crystals opens the opportunity for further investigations
of itinerant magnets with incommensurate spin structures using a wide range of
experimental tools