Header

UZH-Logo

Maintenance Infos

Crystal structure and anisotropic magnetic properties of CaCo4(TeO3)4Cl2


Stolze, Karoline; Kong, Tai; von Rohr, Fabian O; Cava, Robert J (2018). Crystal structure and anisotropic magnetic properties of CaCo4(TeO3)4Cl2. Journal of Solid State Chemistry, 263:141-147.

Abstract

We report on the discovery and the magnetic properties of CaCo4(TeO3)4Cl2. Single-crystal X-ray diffraction shows that this compound crystallizes on a monoclinic lattice, in the space group C2/c with a = 19.869(1) Å, b = 5.323(1) Å, c = 16.965(1) Å and β = 125.091(1)°. The compound has a layered structure that additionally exhibits 1D structural motifs composed of staircase-like double chains of magnetic face- and corner-sharing [CoO5Cl] and [CoO6] octahedra, which are linked by Ca2+ ions and [TeO3]2– units. Temperature-dependent magnetic measurements reveal antiferromagnetic (AFM) ordering with a Néel temperature of TN ≈ 11.5 K and an effective moment of μeff ≈ 5.2 μB/Co consistent with expectations for Co2+ high spin. The Curie-Weiss temperature θ ≈ –42.1 K indicates AFM interactions dominate between the magnetic moments. The magnetic ordering transition in the zero-field heat capacity shows a λ-type anomaly. Direction-dependent magnetic measurements on single-crystals reveal an anisotropic character of the magnetization. For H || c — corresponding to a direction within the layers and perpendicular to the double chains — the AFM transition temperature is suppressed in magnetic fields higher than ~ 7.9 T and a clearly pronounced metamagnetic phase transition is observed.

Abstract

We report on the discovery and the magnetic properties of CaCo4(TeO3)4Cl2. Single-crystal X-ray diffraction shows that this compound crystallizes on a monoclinic lattice, in the space group C2/c with a = 19.869(1) Å, b = 5.323(1) Å, c = 16.965(1) Å and β = 125.091(1)°. The compound has a layered structure that additionally exhibits 1D structural motifs composed of staircase-like double chains of magnetic face- and corner-sharing [CoO5Cl] and [CoO6] octahedra, which are linked by Ca2+ ions and [TeO3]2– units. Temperature-dependent magnetic measurements reveal antiferromagnetic (AFM) ordering with a Néel temperature of TN ≈ 11.5 K and an effective moment of μeff ≈ 5.2 μB/Co consistent with expectations for Co2+ high spin. The Curie-Weiss temperature θ ≈ –42.1 K indicates AFM interactions dominate between the magnetic moments. The magnetic ordering transition in the zero-field heat capacity shows a λ-type anomaly. Direction-dependent magnetic measurements on single-crystals reveal an anisotropic character of the magnetization. For H || c — corresponding to a direction within the layers and perpendicular to the double chains — the AFM transition temperature is suppressed in magnetic fields higher than ~ 7.9 T and a clearly pronounced metamagnetic phase transition is observed.

Statistics

Citations

Dimensions.ai Metrics
3 citations in Web of Science®
3 citations in Scopus®
Google Scholar™

Altmetrics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > Ceramics and Composites
Physical Sciences > Condensed Matter Physics
Physical Sciences > Physical and Theoretical Chemistry
Physical Sciences > Inorganic Chemistry
Physical Sciences > Materials Chemistry
Uncontrolled Keywords:Physical and Theoretical Chemistry, Inorganic Chemistry, Materials Chemistry, Electronic, Optical and Magnetic Materials, Condensed Matter Physics, Ceramics and Composites
Language:English
Date:1 July 2018
Deposited On:06 Mar 2019 16:58
Last Modified:29 Jul 2020 10:06
Publisher:Elsevier
ISSN:0022-4596
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.jssc.2018.04.013

Download

Full text not available from this repository.
View at publisher

Get full-text in a library