Competing Magnetic Ground States of Novel Sawtooth Co<sup>2+</sup> <i>S</i> = 3/2 Chains in NaCo<sub>2</sub>(SeO<sub>3</sub>)<sub>2</sub>(OH)

ORAL

Abstract

Low-dimensional magnetic materials have drawn continued attention in condensed matter physics, owing to their distinct electronic and magnetic properties. In particular, the oxyanion systems-based transition-metal (M) oxide sublattices that are magnetically isolated by closed-shell nonmagnetic oxyanions (SiO4−4, PO3−4, AsO3−4) show great potential for exploring and characterizing new emergent phenomena. Recently we have synthesized single crystals of NaCo2(SeO3)2(OH) and characterized the crystals structure. NaCo2(SeO3)2(OH) belongs to a rare class of compounds, namely delta-chain or saw tooth type structure in which corner sharing isosceles triangles whose vertices consist of one Co(1) and two Co(2) atoms. The magnetic susceptibility reveals a two competing magnetic transition at TN1 = 11 K and TN2 = 3.2 K. The isothermal magnetization data shown a field induced transition at 1.3 kOe. Neutron powder diffraction was used to determine the magnetic structure.

*The research at the Oak Ridge National Laboratory (ORNL) is supported
by the USA. Department of Energy (DOE), Office of Science, Basic Energy
Sciences (BES), Materials Sciences and Engineering Division (MSE).
This research used resources at Spallation Neutron Source, a DOE office
of Science User Facility operated by ORNL.

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Presenters

  • Duminda Sanjeewa

    • University of Tennessee
    • Oak Ridge National Lab

Authors

  • Duminda Sanjeewa

    • University of Tennessee
    • Oak Ridge National Lab

  • Jie Xing

    • Materials Science and Technology Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab

  • Vasile Garlea

    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN
    • Oak Ridge National Lab
    • Neutron Scattering Division, Oak Ridge National Laboratory

  • Keith Taddei

    • Oak Ridge National Lab