Magnetic structures of dysprosium oxysulfide and dysprosium oxyselenide

Abbas, Yehia; Rossat‐Mignod, J.; Quézel, G.; Vettier, C.

doi:10.1016/0038-1098(74)90285-3

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…Some of the first rare earth oxyselenides studied were (Tb,Dy,Ho) 2 O 2 (S,Se) and the local coordination geometry is shown in Fig. 6 for Tb 2 O 2 S (Abbas et al, 1973(Abbas et al, , 1974. The case of Tb 2 O 2 (S,Se) (Abbas et al, 1974;Rossat-Mignod et al, 1974) is particularly interesting as the magnetic structure involves a large canting of the Tb 3+ moment which is not expected given the symmetry of the lattice.…”

Section: Rare Earth Local Magnetismmentioning

confidence: 99%

“…The magnetic structural properties of Ln-O-Se phases where no d transition metal ion is present have not been as fully investigated as transition metal oxyselenide systems. Early work on Tb 2 O 2 (S,Se) and Dy 2 O 2 (S,Se) described above motivated crystal field work to understand the unusual canting measured in the Tb variant (Abbas et al, 1973(Abbas et al, , 1974Rossat-Mignod et al, 1974). For A 4 O 4 Se 3 compounds long-range antiferromagnetic order occurs for Ln = Gd, Tb and Dy phases but has not been observed down to 1.8 K for other analogues (Strobel et al, 2008;Tuxworth et al, 2015).…”

Section: Ln -O -Se Phasesmentioning

confidence: 99%

“…This is always the case for such ions and the degeneracy can only be broken with a field which breaks time reversal symmetry, such as a magnetic field but not an electric. Some of the first rare earth oxyselenides studied were (Tb,Dy,Ho) 2 O 2 (S,Se) and the local coordination geometry is shown in figure 6 for Tb 2 O 2 S (Abbas et al 1973(Abbas et al , 1974. The case of Tb 2 O 2 (S,Se) (Abbas et al 1974 is particularly interesting as the magnetic structure involves a large canting of the Tb 3+ moment which is not expected given the symmetry of the lattice.…”

Section: Local Magnetismmentioning

confidence: 99%

“…Some of the first rare earth oxyselenides studied were (Tb,Dy,Ho) 2 O 2 (S,Se) and the local coordination geometry is shown in figure 6 for Tb 2 O 2 S (Abbas et al 1973(Abbas et al , 1974. The case of Tb 2 O 2 (S,Se) (Abbas et al 1974 is particularly interesting as the magnetic structure involves a large canting of the Tb 3+ moment which is not expected given the symmetry of the lattice. It was therefore concluded in this system that the ground state could not be considered as a doublet, but as a set of doublets with the energy scale between the low-energy crystal fields to be small and of order ⩽1-2 meV.…”

Section: Local Magnetismmentioning

confidence: 99%

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The magnetic and electronic properties of oxyselenides—influence of transition metal ions and lanthanides

Stock¹,

McCabe²

2016

J. Phys.: Condens. Matter

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Magnetic oxyselenides have been a topic of research for several decades, firstly in the context of photoconductivity and thermoelectricity owing to their intrinsic semiconducting properties and ability to tune the energy gap through metal ion substitution. More recently, interest in the oxyselenides has experienced a resurgence owing to the possible relation to strongly correlated phenomena given the fact that many oxyselenides share a similar structure to unconventional superconducting pnictides and chalcogenides. The two dimensional nature of many oxyselenide systems also draws an analogy to cuprate physics where a strong interplay between unconventional electronic phases and localised magnetism has been studied for several decades. It is therefore timely to review the physics of the oxyselenides in the context of the broader field of strongly correlated magnetism and electronic phenomena. Here we review the current status and progress in this area of research with the focus on the influence of lanthanides and transition metal ions on the intertwined magnetic and electronic properties of oxyselenides. The emphasis of the review is on the magnetic properties and comparisons are made with iron based pnictide and chalcogenide systems.

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Section: Rare Earth Local Magnetismmentioning

confidence: 99%

Section: Ln -O -Se Phasesmentioning

confidence: 99%

Section: Local Magnetismmentioning

confidence: 99%

Section: Local Magnetismmentioning

confidence: 99%

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The magnetic and electronic properties of oxyselenides—influence of transition metal ions and lanthanides

Stock¹,

McCabe²

2016

J. Phys.: Condens. Matter

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Zwei Formen von Dy₂OS₂

Schleid

1991

Zeitschrift anorg allge chemie

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Die Oxidation von DyCl2 mit Schwefel in Gegenwart von NaCl (Tantal‐Kapsel, 800°C, 7 d) liefert Einkristalle von Dy2S3 im U2S3‐Typ als Hauptprodukt. Oxidische Verunreinigungen (z. B. DyOCl) werden dabei zu Dy2OS2 umgesetzt, das in zwei verschiedenen einkristallinen Formen anfällt: fast farblose Nadeln (I: orthorhombisch, Pnma (Nr. 62), a = 1542,71(9); b = 380,07(2); c = 674,49(3) pm; Vm = 59,540(6) cm3/mol, Z = 4; R = 0,023; Rw = 0,021) und blaß;gelbe, flächenreiche Prismen (II: monoklin, P21/c (Nr. 14), a = 825,09(6); b = 691,06(5); c = 686,25(5) pm; β = 99,612(7)°; Vm = 58,082(7) cm3/mol, Z = 4; R = 0,026; Rw = 0,025). Entsprechend der um 2,5% kleineren Dichte (Dx = 6,80 für I gegenüber 6,97 g/cm3 für II) soll hier die orthorhombische Form von Dy2OS2 als „Normaldruck”︁‐Form (I) bezeichnet werden. Beide Strukturen von Dy2OS2 werden von O2−‐zentrierten Tetraedern [O(Dy)4]10+ aufgebaut, die in I über zwei cis‐ständige Kanten zu Zick‐Zack‐Ketten der Zusammensetzung ∞1[O(Dy1)3/3(Dy2)1/1]4+, in II über eine Kante und zwei Ecken zu gewellten Schichten der Zusammensetzung ∞2[O(Dy1)3/3(Dy2)1/1]4+, verknüpft sind. Ladungsausgleich und dreidimensionale Vernetzung erfolgt in beiden Fällen über je zwei kristallographisch unterschiedliche S2−, die tetragonal‐pyramidal (C.N. = 5) von Dy3+ umgeben sind. Dy2OS2—I enthält Dy1 in achtfacher (3O und 5S, doppelt bekapptes trigonales Prisma) und Dy2 in sechsfacher anionischer Koordination (1O und 5S, „Oktaeder”︁). In Form II sind beide Dy3+ von jeweils sieben Anionen (Dy1: 3O und 4S, Dy2: 1O und 6S) einfach‐bekappt trigonal‐prismatisch umgeben.

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