%0 Journal Article %1 PhysRevB.105.134424 %A Sukhanov, A. S. %A Tymoshenko, Y. V. %A Kulbakov, A. A. %A Cameron, A. S. %A Kocsis, V. %A Walker, H. C. %A Ivanov, A. %A Park, J. T. %A Pomjakushin, V. %A Nikitin, S. E. %A Morozov, I. V. %A Chernyavskii, I. O. %A Aswartham, S. %A Wolter, A. U. B. %A Yaresko, A. %A Büchner, B. %A Inosov, D. S. %D 2022 %I American Physical Society %J Phys. Rev. B %K b %N 13 %P 134424 %R 10.1103/PhysRevB.105.134424 %T Frustration model and spin excitations in the helimagnet FeP %U https://link.aps.org/doi/10.1103/PhysRevB.105.134424 %V 105 %X The metallic compound FeP belongs to the class of materials that feature a complex noncollinear spin order driven by magnetic frustration. While its double-helix magnetic structure with a period λs≈5c, where c is the lattice constant, was previously well determined, the relevant spin-spin interactions that lead to that ground state remain unknown. By performing extensive inelastic neutron scattering measurements, we obtained the spin-excitation spectra in a large part of the momentum-energy space. The spectra show that the magnons are gapped with a gap energy of ∼5meV. Despite the 3D crystal structure, the magnon modes display strongly anisotropic dispersions, revealing a quasi-one-dimensional character of the magnetic interactions in FeP. The physics of the material, however, is not determined by the dominating exchange, which is ferromagnetic. Instead, the weaker two-dimensional antiferromagnetic interactions between the rigid ferromagnetic spin chains drive the magnetic frustration. Using linear spin-wave theory, we were able to construct an effective Heisenberg Hamiltonian with an anisotropy term capable of reproducing the observed spectra. This enabled us to quantify the exchange interactions in FeP and determine the mechanism of its magnetic frustration.

@article{PhysRevB.105.134424, abstract = {The metallic compound FeP belongs to the class of materials that feature a complex noncollinear spin order driven by magnetic frustration. While its double-helix magnetic structure with a period λs≈5c, where c is the lattice constant, was previously well determined, the relevant spin-spin interactions that lead to that ground state remain unknown. By performing extensive inelastic neutron scattering measurements, we obtained the spin-excitation spectra in a large part of the momentum-energy space. The spectra show that the magnons are gapped with a gap energy of ∼5meV. Despite the 3D crystal structure, the magnon modes display strongly anisotropic dispersions, revealing a quasi-one-dimensional character of the magnetic interactions in FeP. The physics of the material, however, is not determined by the dominating exchange, which is ferromagnetic. Instead, the weaker two-dimensional antiferromagnetic interactions between the rigid ferromagnetic spin chains drive the magnetic frustration. Using linear spin-wave theory, we were able to construct an effective Heisenberg Hamiltonian with an anisotropy term capable of reproducing the observed spectra. This enabled us to quantify the exchange interactions in FeP and determine the mechanism of its magnetic frustration.}, added-at = {2022-10-19T20:27:15.000+0200}, author = {Sukhanov, A. S. and Tymoshenko, Y. V. and Kulbakov, A. A. and Cameron, A. S. and Kocsis, V. and Walker, H. C. and Ivanov, A. and Park, J. T. and Pomjakushin, V. and Nikitin, S. E. and Morozov, I. V. and Chernyavskii, I. O. and Aswartham, S. and Wolter, A. U. B. and Yaresko, A. and B\"uchner, B. and Inosov, D. S.}, biburl = {https://www.bibsonomy.org/bibtex/2e4b05838f89b3589d779443215b836a0/ctqmat}, day = 20, description = {Phys. Rev. B 105, 134424 (2022) - Frustration model and spin excitations in the helimagnet FeP}, doi = {10.1103/PhysRevB.105.134424}, interhash = {1c887176beccc9e2d03607716b42e8f7}, intrahash = {e4b05838f89b3589d779443215b836a0}, journal = {Phys. Rev. B}, keywords = {b}, month = {04}, number = 13, numpages = {13}, pages = 134424, publisher = {American Physical Society}, timestamp = {2023-01-16T14:49:29.000+0100}, title = {Frustration model and spin excitations in the helimagnet FeP}, url = {https://link.aps.org/doi/10.1103/PhysRevB.105.134424}, volume = 105, year = 2022 }