Geometric magnetic frustration in RE{sub 2}O{sub 2}S oxysulfides (RE = Sm, Eu and Gd)

Journal Article · Sun Jun 01 04:00:00 EDT 2014 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.03.008· OSTI ID:22348657

Biondo, V.; Sarvezuk, P. W.C.; Ivashita, F. F.; Silva, K. L. ^[1]; Isnard, O. ^[2]

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1. Departamento de Física, Universidade Estadual de Maringá, Av. Colombo, 5790 Maringá, PR (Brazil)
2. Institut Néel – CNRS, Université Joseph Fourier, 25 Rue des Martyrs, 38042 Grenoble (France)

Graphical abstract: Stacked planes in the <001> direction of an oxysulfide structure, showing the triangular nets formed by rare earth cations, which moments present geometric magnetic frustration. - Highlights: • We prepared monophasic RE{sub 2}O{sub 2}S Oxysulfides (RE = Sm, Eu and Gd). • RE{sub 2}O{sub 2}S compounds were characterized regarding structural and magnetic properties. • Mössbauer spectra were obtained for Eu{sub 2}O{sub 2}S and Gd{sub 2}O{sub 2}S at different temperatures. • Oxysulfides present geometric magnetic frustration of the rare-earth sublattice. - Abstract: RE{sub 2}O{sub 2}S oxysulfides (with RE = Sm, Eu and Gd) were prepared and characterized regarding their structural and magnetic properties. The compounds crystallized in the trigonal symmetry (space group P-3m/D{sub 3}{sup 3}d), with the lattice parameter varying linearly with the ionic radius of the RE cation. All these oxysulfides are magnetically frustrated and only the gadolinium sample showed magnetic order down to 3 K. The magnetic frustration is attributed to the spatial distribution of cations over the lattice, where the RE’s magnetic moments occupy the sites forming a triangular plane lattice, perpendicular to the direction. This geometric magnetic frustration was firstly recognized for these oxysulfides.

• OSTI ID: 22348657
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 54; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CATIONS
CRYSTAL STRUCTURE
GADOLINIUM
LATTICE PARAMETERS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
OXYSULFIDES
RHENIUM IONS
SPACE GROUPS
SPECTRA
SPECTROSCOPY
X-RAY DIFFRACTION