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Lattice-tuned magnetism of Ru4+(4d4) ions in single crystals of the layered honeycomb ruthenates Li2RuO3 and Na2RuO3

J. C. Wang, J. Terzic, T. F. Qi, Feng Ye, S. J. Yuan, S. Aswartham, S. V. Streltsov, D. I. Khomskii, R. K. Kaul, and G. Cao
Phys. Rev. B 90, 161110(R) – Published 29 October 2014
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Abstract

We synthesize and study single crystals of the layered honeycomb lattice Mott insulators Na2RuO3 and Li2RuO3 with magnetic Ru4+(4d4) ions. The newly found Na2RuO3 features a nearly ideal honeycomb lattice and orders antiferromagnetically at 30 K. Single crystals of Li2RuO3 adopt a honeycomb lattice with either C2/m or more distorted P21/m below 300 K, depending on detailed synthesis conditions. We find that Li2RuO3 in both structures hosts a well-defined magnetic state, in contrast to the singlet ground state found in polycrystalline Li2RuO3. A phase diagram generated based on our results uncovers a new, direct correlation between the magnetic ground state and basal-plane distortions in the honeycomb ruthenates.

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  • Received 22 August 2014
  • Revised 26 September 2014

DOI:https://doi.org/10.1103/PhysRevB.90.161110

©2014 American Physical Society

Authors & Affiliations

J. C. Wang1,2,3, J. Terzic1, T. F. Qi1, Feng Ye1,2, S. J. Yuan1,4, S. Aswartham1, S. V. Streltsov5,6, D. I. Khomskii7, R. K. Kaul1, and G. Cao1,*

  • 1Center for Advanced Materials, Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA
  • 2Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics, Renmin University of China, Beijing 100872, China
  • 4Department of Physics, Shanghai University, Shanghai, China
  • 5Institute of Metal Physics, 620041 Ekaterinburg, Russia
  • 6Ural Federal University, 620002 Ekaterinburg, Russia
  • 7II.Physikalisches Institut, Universitaet zu Koeln, Germany

  • *Corresponding author: cao@uky.edu

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Issue

Vol. 90, Iss. 16 — 15 October 2014

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