Geometric Magnetic Frustration in rock-salt ordered A$_{5}$BO$_{6}$ materials

ORAL

Abstract

When the structural arrangement of ion in a material inhibits the development of magnetic order, geometric frustration occurs. Most often this occurs with antiferromagnetically correlated moments with triangular and tetrahedral configurations, and diverse ground states may arise depending on the balance between competing interactions. Hence there is great interest in finding new frustrated systems, to go beyond the well-studied pyrochlore, spinel, and Kagome lattice frustrated systems. Here we present materials based on the A$_{5}$BO$_{6}$ structure, which exhibit ``rock-salt'' order of magnetic B cations (Ru, Re or Os). Specimens with d$^{1}$, d$^{2}$, or d$^{3}$ configurations may be produced depending on A-site doping. These systems crystallize into either orthorhombic \textit{Fddd} or monoclinic \textit{C2/m} settings, each of which exhibits a distinct local magnetic environment, with diverse properties reported in various materials. Most recently, we have synthesized Li$_{4}$MgOsO$_{6}$ and Li$_{4}$MgReO$_{6}$, which may crystallize into either crystal system, making them ``Rosetta stones'' of sorts in elucidating the nature of frustration in these systems. We report here the results of magnetic and structural characterization of these materials.

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Authors

  • Jeremy P. Carlo

    Villanova University

  • Shahab Derakhshan

    Drexel University, Univ of Delaware, Princeton University, Naval Surface Warfare Center\Carderock Division\West Bethesda site, Naval Surface Warfare Center and Georgetown Univ., Dept. of Physics and Astronomy, University of Delaware, Dept. of Physics and Astronomy, University of Deleware, Dept. of Physics and Astronomy, University of Nevada-Reno, university of Delaware, Contributors, Department of Physics, Astronomy and Geosciences, Towson University, Choice Research Group, Univ of the Sciences in Philadephia, Rutgers Univ, National Institute of Standards and Technology, Department of Chemistry, West Chester University, West Chester, PA 19383, Bucknell University, Towson University, University of Maryland, College of William and Mary, Naval Research Laboratory, Department of Physics, Villanova University, Department of Chemistry, Faculty of Medicine, University of Brescia, Department of Chemistry, State University of New York at Potsdam, Delaware State University DE, NIH Bethesda MD, Wilmington Friends School DE, University Of Rochester NY, Delaware State University, Department of Physics and Astronomy,West Virginia University, The National Energy Technology Laboratory, Non-tenure track professor at research institution, Government Sponsored Laboratory, Research and Development at Industrial Company, Tenure-track Professor at 4 yr college, Department of Physics and Astronomy and Department of Chemistry and Biochemistry, University of Delaware, Biology and Soft Matter Division, Oak Ridge National Laboratory, and Department of Physics and Astronomy, The University of Tennessee, Biology and Soft Matter Division, Oak Ridge National Laboratory, Lehigh Univ, Johns Hopkins Univ, NIST, GMU, GWU, Lock Haven University of PA, Univ of Maryland-Balt County; Center for Nanoscale Materials, Argonne National Laboratory, Department of Chemistry, Northwestern University, Univ of Maryland-Balt County, Pennsylvania State University, BAE Systems, Inc., Nashua, New Hampshire 03061, Department of Physics, West Virginia University, Morgantown, West Virginia, 26506-6315, California State University, Long Beach