Magnetic ground-state of two new highly one-dimensional ferromagnetic chain compounds <i>M</i>(NCS)<sub>2</sub>(thiourea)<sub>2</sub>; <i>M </i>= Co, Ni.

ORAL

Abstract

Low-dimensional magnetic materials have garnered much attention from theorists and experimentalists alike for many years. Chains of low-spin, ferromagnetically (FM) or antiferromagnetically (AFM) coupled magnetic-ions can both harbour exotic magnetic ground-states: such as the gapped Haldane ground state in Heisenberg AFM chains, or the field-induced quantum paramagnetic state in Ising-like FM chains. In terms of physically realizing such systems, co-ordination chemistry has had great success in promoting crystal architectures that can lead to quasi-1D behaviours. Altering the bridging or non-bridging ligand species can modify both the Heisenberg exchange (J) and single-ion anisotropy (D). It is the interplay of these two parameters that ultimately determines the magnetic ground-state.
To this end, we have recently synthesised two new, highly one-dimensional and isostructural molecule-based magnets; M(NCS)2(thiourea)2 [thiourea = CH4N2S, M is Co (S = 3/2) or Ni (S=1)]. We employ a combination of magnetometry, heat capacity and muon spin-rotation in addition to theoretical charge density analysis, in an attempt to resolve the magnetic ground-state of both materials.

*This project has received funding from the European Research Council (grant no. 681260).

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Presenters

  • Sam Curley

    • Department of Physics, University of Warwick
    • Univ of Warwick
    • Physics, University of Warwick

Authors

  • Sam Curley

    • Department of Physics, University of Warwick
    • Univ of Warwick
    • Physics, University of Warwick

  • Robert C Williams

    • Department of Physics, University of Warwick
    • Univ of Warwick

  • Paul Goddard

    • Physics, Warwick University
    • Department of Physics, University of Warwick
    • Univ of Warwick
    • Physics, University of Warwick
    • University of Warwick

  • Rebecca Scatena

    • Department of Physics, University of Oxford

  • Stephen Blundell

    • Department of Physics, University of Oxford
    • Department of Physics, University of Oxford, Oxford, UK
    • University of Oxford
    • Physics, University of Oxford

  • Piero Macchi

    • Department of Chemistry and Biochemistry, University of Bern

  • Thomas Hicken

    • Durham University
    • Centre for Materials Physics, Durham University
    • Physics, Durham University

  • Tom Lancaster

    • Durham University
    • Centre for Materials Physics, Durham University
    • Physics, University of Durham
    • Physics, Durham University

  • Fan Xiao

    • Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
    • Paul Scherrer Institut

  • James C Eckert

    • Department of Physics, Harvey Mudd College

  • Vivien Zapf

    • NHMFL, Los Alamos National Laboratory
    • Los Alamos National Laboratory, National High Magnetic Field Laboratory
    • Los Alamos National Laboratory
    • National High Magnetic Field Lab, Los Alamos National Lab
    • Los Alamos Natl Lab

  • Jacqueline Villa

    • Department of Chemistry and Biochemistry, Eastern Washington University
    • Eastern Washington University

  • Jamie Manson

    • Department of Chemistry and Biochemistry, Eastern Washington University
    • Eastern Washington University