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Articles by S. E. Nikitin
Observation of the spiral spin liquid in a triangular-lattice material - Nature Communications
Abstract The spiral spin liquid (SSL) is a highly degenerate state characterized by a continuous contour or surface in reciprocal space spanned by a spiral propagation vector. Although the SSL state has been predicted in a number of various theoretical models, very few materials are so far experimentally identified to host such a state. Via combined single-crystal wide-angle and small-angle neutron scattering, we report observation of the SSL in the quasi-two-dimensional delafossite-like AgCrSe2.
Helical spin dynamics in commensurate magnets: A study on brochantite, ${\mathrm{Cu}}_{4}{\mathrm{SO}}_{4}{(\mathrm{OH})}_{6}$
We report the direct observation of a commensurate-ordered antiferromagnetic (AFM) state but incommensurate helical spin dynamics in the natural mineral brochantite Cu4SO4(OH)6 through neutron diffraction and neutron spectroscopy measurements. Inelastic neutron scattering measurements reveal magnonlike excitations with considerable dispersion along the c axis and almost flat branches in other principal directions, indicating the strong one-dimensional character of the magnetic correlations.
Confinement of many-body Bethe strings
Abstract Based on the Bethe ansatz approach and inelastic neutron scattering experiments, we reveal the evolution of confinement of many-body Bethe strings in ordered regions of the quasi-one-dimensional antiferromagnet YbAlO3. In the antiferromagnetic phase, the spin dynamics is dominated by confined length-1 Bethe strings, whose dominancy in the high-energy branch of the excitation spectrum yields to confined length-2 Bethe strings when the material is tuned to the spin-density-wave phase.
Publisher Correction: Multiple fermion scattering in the weakly coupled spin-chain compound YbAlO3 - Nature Communications
Correction to: Nature Communications https://doi.org/10.1038/s41467-021-23585-z, published online 14 June 2021. The original version of this Article contained an error in ref. 20, which was incorrectly given with the wrong title as: “Agrapidis, C. E., van den Brink, J. & Nishimoto, S. Ground state and low-energy excitations of the Kitaev-Heisenberg two-leg ladder. Phys. Rev. B 99, 224423 (2019)”. The correct form of ref. 20 is: “Agrapidis, C. E., van den Brink, J. & Nishimoto, S.
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