Ferromagnetic Mn <sup>3+</sup> Sawtooth Chains in A <sub>2</sub>(Mn <sub>2</sub>O)(SeO <sub>3</sub>) <sub>3</sub> (A = K, Rb) Quaternary Selenites. - Université de Lille Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2024

Ferromagnetic Mn 3+ Sawtooth Chains in A 2(Mn 2O)(SeO 3) 3 (A = K, Rb) Quaternary Selenites.


Two quaternary manganese selenites, A2(Mn2O)(SeO3)3 (A = K, Rb), have been synthesized by hydrothermal reactions. They both crystallize in a complex triclinic (P-1) structure built of Jahn–Teller (JT) distorted Mn3+O4+2 octahedra, connected into nearly isosceles [Mn3O14] triangles, themselves arranged into so-called “sawtooth (ST) chains”. The K and Rb compounds show subtle variations in the orientations of the MnO4 planes inside the elementary triangles. The ST chains are structurally and magnetically isolated by SeO3 groups and alkali cations. In the ST chains, predominant ferromagnetic interactions were calculated and verified experimentally, which finally order antiferromagnetically between the chains around TN ≈ 22 K. The spin exchanges calculated by DFT + U and fitted by Monte Carlo simulations allow for the quantification of an effective “overall” model. The specific role of the μ3-O bridge on the ferromagnetic (FM) exchanges is discussed, together with spin reorientations observed in the ordered state. Magnetocrystalline anisotropy along the [110] direction stabilized by ∼50 meV per Mn by spin–orbit coupling (SOC) was found by DFT + U + SOC.
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Dates et versions

hal-04643084 , version 1 (10-07-2024)



Yaping Li, Feifan Li, Olivier Mentre, Claire Minaud, Angel Arevalo Lopez, et al.. Ferromagnetic Mn 3+ Sawtooth Chains in A 2(Mn 2O)(SeO 3) 3 (A = K, Rb) Quaternary Selenites.. Inorganic Chemistry, 2024, Inorg Chem, ⟨10.1021/acs.inorgchem.3c03522⟩. ⟨hal-04643084⟩
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