Canted antiferromagnet superimposed on a buckled kagomé network in RbMn4(PO4)3. Issue 5 (24th April 2018)

• Record Type: Journal Article
• Authors: Yakubovich, Olga; Kiriukhina, Galina; Shvanskaya, Larisa; Maximova, Olga; Volkov, Anatoliy; Dimitrova, Olga; Ovchenkov, Evgeniy; Yumashev, Oleg; Iqbal, Asif; Rahaman, Badiur; Saha-Dasgupta, Tanusri; Vasiliev, Alexander
• Is Part Of: Acta crystallographica. Volume 74:Issue 5(2018)
• Page Start: 641
• Page End: 649
• Publication Date: 2018-04-24
• Subjects: morphotropic series -- kagomé network -- frustration -- antiferromagnetism -- crystal structure -- canted antiferromagnet; Crystallography -- Periodicals; Crystals -- Periodicals; 548.3
• DOI: 10.1107/S2053229618006034
• Languages: English
• ISSNs: 2053-2296

Abstract

Abstract : The crystal structure of RbMn4 (PO4 )3, which was synthesized hydrothermally, has been refined in the space group Pnnm ( D 2 h 12 ). At low temperatures, the compound orders into a canted antiferromagnetic state with finite spontaneous magnetization. Abstract : Rubidium tetramanganese tris(phosphate), RbMn4 (PO4 )3, has been synthesized as single crystals under hydrothermal conditions. The crystal structure was refined in the space group Pnnm ( D 2 h 12 ). It is argued that the size factor R M / R A, i.e. the ratio of the A + ionic radius to the M 2+ ionic radius, within the morphotropic series AM 4 ( T O4 )3 corresponds to a specific type of crystal structure. At low temperatures, the antiferromagnet superimposed on a buckled kagomé network in RbMn4 (PO4 )3 experiences a transition into a long‐range ordered state with finite spontaneous magnetization. First principles calculations provide the dominant magnetic exchange interactions both within and between the kagomé layers. The analysis of these interactions allows us to suggest a model of alternating ferromagnetic and antiferromagnetic arrangements within chains of Mn3 atoms.