Low-temperature and dynamic magnetism of highly frustrated 5d2 Li4MgOsO6 in comparison with 5d3 Li3Mg2OsO6

ORAL

Abstract

Geometric magnetic frustration (GMF) has attracted substantial interest due to the exotic physics and rich phase diagrams revealed by the cancellation of normally-dominant magnetic interactions,giving impetus for the search for novel frustrated systems, most often based on antiferromagneticcorrelations between magnetic ions decorating triangular or tetrahedral lattices. We report low-temperature magnetic susceptibility and muon spin relaxation results on Li4MgOsO6 and Li3Mg2OsO6, members of the A5BO6 "rock salt ordered" family of frustrated materials. In Li3Mg2OsO6 we find spin freezing below 12K. In Li4MgOsO6, which can crystallize into either orthorhombic Fddd or monoclinic C2/m crystal symmetries depending on synthesis conditions, we find magnetism consistent with glassy-like behavior dominating below 2K, with partial ordering and evidence for dynamics at somewhat higher temperatures.

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Presenters

  • Jeremy Carlo

    Department of Physics, Villanova University, Physics Department, Villanova University

Authors

  • Jeremy Carlo

    Department of Physics, Villanova University, Physics Department, Villanova University

  • Shahab Derakhshan

    Department of Chemistry and Biochemistry, California State University - Long Beach

  • Thomas Gredig

    Department of Physics, California State University - Long Beach, Department of Physics and Astronomy, California State University Long Beach, California State University, Long Beach

  • Graeme Luke

    Department of Physics, McMaster University, Physics and Astronomy, McMaster University, McMaster University, Department of Physics and Astronomy, McMaster University

  • John Greedan

    Department of Chemistry and Chemical Biology, McMaster University