Publications by authors named "M Skoulatos"
We report the experimental determination of the magnetic exchange parameter (J/kB= 2.88 ± 0.02 K) for the Spin-3/2 ferromagnetic (FM) Kagomé lattice system: CoVOusing the temperature dependence of dc-magnetic susceptibility() data by employing the fundamental Heisenberg linear chain model.
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- - The study explores how spin excitations, or magnons, behave in a unique magnetic structure called skyrmion tubes, which shows a parallel to the Lorentz force acting on charged particles in magnetic fields.
- - By using polarized inelastic neutron scattering, researchers examined how these magnons propagate in manganese silicide and found patterns resembling emergent Landau levels due to the skyrmion’s nontrivial topology.
- - The findings indicate a distinct topological magnon band structure in reciprocal space, linking the complex arrangement of the skyrmion lattice to the observed behavior of these spin excitations.
We report on the magnetism of charge-stripe ordered LaNiO by neutron scattering and μSR. On going towards zero energy transfer there is an observed wave vector offset in the centring of the magnetic excitations and magnetic Bragg reflections, meaning the excitations cannot be described as Goldstone modes of the magnetic order. Weak transverse field μSR measurements determine the magnetically order volume fraction is 87% from the two stripe twins, and the temperature evolution of the magnetic excitations is consistent with the low energy excitations coming from the magnetically ordered volume of the material.
View Article and Find Full Text PDFWe report an extraordinary pressure dependence of the magnetic interactions in the metal-organic system [CuF_{2}(H_{2}O)_{2}]_{2}pyrazine. At zero pressure, this material realizes a quasi-two-dimensional spin-1/2 square-lattice Heisenberg antiferromagnet. By high-pressure, high-field susceptibility measurements we show that the dominant exchange parameter is reduced continuously by a factor of 2 on compression.
View Article and Find Full Text PDFWe investigate the effect of Co^{2+} (spin-1/2) impurities on the magnetic ground state and low-lying spin excitations of the quasione-dimensional spin-1/2 antiferromagnet SrCuO_{2} by means of neutron scattering, muon spin spectroscopy, and bulk (ac and dc) magnetic susceptibilities. We found that dilute Co doping induces an Ising-like anisotropy and enhances the magnetic ordering temperature rather significantly, but preserves the gapless nature of the spin excitations. These results are in apparent contradiction with the recent studies of Ni (spin-1) doped SrCuO_{2}.
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