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Helical spin dynamics in commensurate magnets: A study on brochantite, Cu 4 SO 4 ( OH ) 6

Nikitin, S. E.; Xie, Tao; Gazizulina, A. 1; Ouladdiaf, B.; Velamazán, J. A. Rodríguez; Díaz-Ortega, I. F.; Nojiri, H.; Anovitz, L. M.; dos Santos, A. M.; Prokhnenko, O.; Podlesnyak, A.
1 Institut für QuantenMaterialien und Technologien (IQMT), Karlsruher Institut für Technologie (KIT)

Abstract:

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. We experimentally observe the effect of the uniform Dzyaloshinskii-Moriya (DM) interaction, which elevates the degeneracy of the spin-wave modes, shifting them in opposite directions in reciprocal space. The system has a commensurate AFM ground state, stabilized by the anisotropic symmetric Heisenberg exchange interactions, and quasi-one-dimensional chiral spin dynamics due to the antisymmetric DM interaction. Employing linear spin-wave theory, we were able to construct an effective Heisenberg Hamiltonian. We quantify both the symmetric exchange parameters and the DM vector components in Cu4SO4(OH)6 and determine the mechanism of the magnetic frustration. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162199
Veröffentlicht am 22.09.2023
Originalveröffentlichung
DOI: 10.1103/PhysRevResearch.5.033111
Scopus
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für QuantenMaterialien und Technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 08.2023
Sprache Englisch
Identifikator ISSN: 2643-1564
KITopen-ID: 1000162199
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in Physical Review Research
Verlag American Physical Society (APS)
Band 5
Heft 3
Seiten 033111
Vorab online veröffentlicht am 17.08.2023
Nachgewiesen in Dimensions
Scopus
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