Antiferromagnetic order and consequences on the transport properties of Ba${}_4$Ru${}_3$O${}_{10}$

Abstract

Barium ruthenate Ba${}_4$Ru${}_3$O${}_{10}$, in which Ru${}_3$O${}_{12}$ trimers are connected together to form a chequered two-dimensional framework, has been synthesised and its structural, magnetic and transport properties studied between 300 K and 2 K. The paramagnetic to antiferromagnetic transition at $T_N\sim 105$ K evidenced on the susceptibility curve coincides with an increase of electron localization in transport measurements. Thermoelectric power and Hall coefficient measurements both exhibit dramatic changes at $T_N$, characteristic of a reconstruction of the bands structure near the Fermi level. No pronounced structural changes are observed at TN in this compound. The magnetic scattering signal on the neutron powder diffraction patterns below $T_N$ is weak, but can be tentatively modelled with an antiferromagnetic ordering of the spins at both ends of a trimer, the spin of the more symmetric Ru site remaining idle. Crystal field and strong spin-orbit coupling at the Ru${}^{4+}$ site seem to be the key parameters to understand the magnetic state of Ba${}_4$Ru${}_3$O${}_{10}$.

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• Spin-orbit driven Peierls transition and possible exotic superconductivity in CsW${}_2$O${}_6$
• Emergence of spinons in layered trimer iridate Ba4Ir3O10
• A Spin Glass State in Ba3TiRu2O9
• Epitaxial stabilization of metastable 3C BaRuO3 thin film with ferromagnetic non-Fermi liquid phase
• X-ray crystal structure analysis and the Ru valence of Ba4Ru3O10 single crystals
• Structural and Magnetic Transitions in the Planar Antiferromagnet Ba${}_4$Ir${}_3$O${}_{10}$
• Partial molecular orbitals in face-sharing 3$d$ manganese trimer: Comparative studies on Ba${}_4$TaMn${}_3$O${}_{12}$ and Ba${}_4$NbMn${}_3$O${}_{12}$
• Magnon, doublon and quarton excitations in 2D S=1/2 trimerized Heisenberg models
• Complex magnetic structure in Ba5Ru3O12 with isolated Ru3O12-trimer
• Interplay between trimer structure and magnetic ground state in Ba5Ru3O12 probed by Neutron and muSR techniques