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Experimental Evidence for Nonspherical Magnetic Form Factor in Ru3

Sarkis, Colin L. ; Villanova, John W. ; Eichstaedt, Casey ; Eguiluz, Adolfo G. ; Fernandez-Baca, Jaime A. ; Matsuda, Masaaki ; Yan, Jiaqiang ; Balz, Christian ; Banerjee, Arnab ; Tennant, D. Alan ; Berlijn, Tom ; Nagler, Stephen E.

Physical Review B, 2024-03, Vol.109 (10)

United States

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  • Título:
    Experimental Evidence for Nonspherical Magnetic Form Factor in Ru3
  • Autor: Sarkis, Colin L. ; Villanova, John W. ; Eichstaedt, Casey ; Eguiluz, Adolfo G. ; Fernandez-Baca, Jaime A. ; Matsuda, Masaaki ; Yan, Jiaqiang ; Balz, Christian ; Banerjee, Arnab ; Tennant, D. Alan ; Berlijn, Tom ; Nagler, Stephen E.
  • Assuntos: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; crystal-field theory ; form factors ; magnetism ; neutron scattering
  • É parte de: Physical Review B, 2024-03, Vol.109 (10)
  • Notas: USDOE Office of Science (SC)
    NREL/JA-5K00-89612
    AC36-08GO28308
  • Descrição: The Mott insulator ..alpha..-RuCl3 has generated great interest in the community due to its possible field-induced Kitaev quantum spin liquid state. Despite enormous effort spent trying to obtain the form of the low-energy Hamiltonian, there is currently no agreed upon set of parameters which is able to explain all of the data. A key piece of missing information lies in the determination of the magnetic form factor of Ru3+, particularly for a true quantitative treatment of inelastic neutron scattering data. Here we present the experimentally derived magnetic form factor of Ru3+ in the low spin 4d5 state using polarized neutron diffraction within the paramagnetic regime on high-quality single crystals of ..alpha..-RuCl3. We observe strong evidence of an anisotropic form factor, expected of the spin-orbit coupled jeff=12 ground state. We model the static magnetization density in increasing complexity from simple isotropic cases, to a multipolar expansion, and, finally, ab initio calculations of the generalized jeff=12 ground state. Comparison of both single ion models and inclusion of Cl- anions support the presence of hybridization of Ru3+ with the surrounding Cl- ligands.
  • Editor: United States
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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