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Powder neutron diffraction investigation of the crystal and magnetic structures of NH4Fe(HPO4)2 and its deuterated form

AuthorsAlfonso, Belén F.; Piqué, Carmen; Trobajo, Camino CSIC ORCID; García, José R. CSIC ORCID; Rodríguez-Fernández, Jesús; Fernández-Díaz, M. Teresa; Blanco, J. A.
Issue Date2011
PublisherInstitute of Physics Publishing
CitationJournal of Physics: Conference Series 325: 012014 (2011)
AbstractThe NH4Fe(HPO4)2 and its deuterated form, ND4Fe(DPO4)2, were investigated in detail from powder neutron diffraction data allowing a precise determination of the hydrogen positions and low temperature magnetic structures. Below TC = 17.82 K they order with a ferrimagnetic structure and the magnetic moments lying in the crystallographic plane ac. As the temperature is lowered to Tt = 3.52 K the system undergoes a magnetic phase transition to an equal moment antiphase structure characterized by the propagation vector close to KAF ≈ (1/16,0,1/16) and a magnetic moment for the Fe3+ ions of 4.8 μB at 1.89 K. The low symmetry of this crystal structure and the complex pattern of competing superexchange pathways are responsible for the existence of this double magnetic phase transition.
DescriptionTrabajo presentado al "5th Meeting of the Spanish Neutron Scattering Association" celebrado en Gijón del 28 al 30 de junio de 2010.
Identifiersdoi: 10.1088/1742-6596/325/1/012014
issn: 1742-6588
Appears in Collections:(CINN) Artículos
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