Synthesis, crystal and magnetic structure of the spin-chain compound A g2Ru O4
Prasad BE, Sadhukhan S, Hansen TC, Felser C, Kanungo S, Jansen M (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 4
Article Number: 024418
Journal Issue: 2
DOI: 10.1103/PhysRevMaterials.4.024418
Abstract
We report synthesis and crystal structure refinement of Ag2RuO4, followed by combined analysis of its physical properties through bulk experimental tools (magnetic susceptibility, electron transport, and heat capacity measurements), a microscopic experimental tool (temperature dependent neutron diffraction), and ab initio first-principles calculations. We observe a rather unique (RuO3/1O2/2)n polyoxoanion, where Ru is in a distorted trigonal bipyramidal coordination by oxygen. The RuO5 polyhedra are linked via the apical oxygen atoms to form chains extending along the crystallographic a axis. Crystal structure, magnetization, and ab initio calculations indicate that Ru is in the +6 oxidation state with a nominal valence electron configuration of 4d2. Bulk magnetization, specific-heat, and neutron-diffraction measurements provide clear indication of an antiferromagnetic transition around 75 K with moderate spin canting in the order of 30 with respect to the c axis. The neutron-diffraction results as well as the density functional theory based first-principles calculations of exchange interactions revealed that the strong intrachain interaction is predominantly of ferromagnetic (FM) type, and that this spin order along the chains couples with the neighboring chains through comparatively weak FM and antiferromagnetic interactions. Notably, the Landé g factor is found to be 1.8 (with an infinite chain model and even a simple Curie-Weiss approach), away from the ideal value of 2, due to the low dimensionality of the Ru/O substructure.
Involved external institutions
Indian Institute of Technology Goa
India (IN)
Institute Laue-Langevin (ILL)
France (FR)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
India (IN)
Institute Laue-Langevin (ILL)
France (FR)
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
How to cite
APA:
Prasad, B.E., Sadhukhan, S., Hansen, T.C., Felser, C., Kanungo, S., & Jansen, M. (2020). Synthesis, crystal and magnetic structure of the spin-chain compound A g2Ru O4. Physical Review Materials, 4(2). https://doi.org/10.1103/PhysRevMaterials.4.024418
MLA:
Prasad, Beluvalli E., et al. "Synthesis, crystal and magnetic structure of the spin-chain compound A g2Ru O4." Physical Review Materials 4.2 (2020).
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