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Scientific article
English

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

Published inJournal of solid state chemistry, vol. 263, p. 141-147
Publication date2018-07
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.

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Keywords
  • Transition metal oxohalide
  • Low-dimensional structure
  • Stereochemically active lone pair
  • Anisotropic magnetic properties
  • AFM ordering
  • Metamagnetic transition
Affiliation Not a UNIGE publication
Research group
Citation (ISO format)
STOLZE, Karoline et al. Crystal structure and anisotropic magnetic properties of CaCo<sub>4</sub>(TeO<sub>3</sub>)<sub>4</sub>Cl<sub>2</sub>. In: Journal of solid state chemistry, 2018, vol. 263, p. 141–147. doi: 10.1016/j.jssc.2018.04.013
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ISSN of the journal0022-4596
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