Abstract
The random fluctuations of spins give rise to many interesting physical phenomena, such as the âorder-from-disorderâ arising in frustrated magnets and unconventional Cooper pairing in magnetic superconductors. Here we show that the exchange of spin waves between extended topological defects, such as domain walls, can result in novel magnetic states. We report the discovery of an unusual incommensurate phase in the orthoferrite TbFeO3 using neutron diffraction under an applied magnetic field. The magnetic modulation has a very long period of 340âà at 3âK and exhibits an anomalously large number of higher-order harmonics. These domain walls are formed by Ising-like Tb spins. They interact by exchanging magnons propagating through the Fe magnetic sublattice. The resulting force between the domain walls has a rather long range that determines the period of the incommensurate state and is analogous to the pion-mediated Yukawa interaction between protons and neutrons in nuclei.
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Acknowledgements
D.N.A. and S.L. thank the Deutsche Forschung Gemeinschaft for support under contract AR 613/2-1. The neutron scattering work was supported by the Danish National Research Council through DANSCATT. N.P.J. thanks J. B. Hansen, for support and guidance. M.M. was supported by the FOM grant 08.0952.
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D.N.A. initiated the project, D.N.A. and M.M. interpreted the results and wrote the paper, and M.M. and S.A. developed the theory. N.P.J. and H.N.B. contributed to the interpretation of the experimental results. K.L. and L.T.K. supported the project. Neutron experiments and analysis of these data were conducted by N.P.J., D.N.A., K.P., D.L., V.G.P. and H.N.B. Bulk property and characterization measurements were conducted by S.L., H.R., B.K., S.P. and K.K., and A.M. grew the single crystal. All authors commented on the manuscript.
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Artyukhin, S., Mostovoy, M., Jensen, N. et al. Solitonic lattice and Yukawa forces in the rare-earth orthoferrite TbFeO3. Nature Mater 11, 694â699 (2012). https://doi.org/10.1038/nmat3358
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DOI: https://doi.org/10.1038/nmat3358
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