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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.

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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