Low-dimensional quantum magnets supported by non-covalent interactions

ORAL

Abstract

At ambient pressure, [Ni(HF2)(pyz)2]SbF6 contains S = 1 Ni(II) ions arranged in a tetragonal network consisting of 1D Ni-FHF-Ni chains (J) cross-linked by pyrazine (pyz) ligands (J’). Previous work determined D = 13.3 K, J = 10.4 K and J’ = 1.4 K [1]. Below TN = 12.2 K, long-range magnetic order sets in and, as revealed by neutron diffraction, is of the XY-type with Ni(II) moments occupying any collinear orientation in the crystallographic ab-plane. Pressure-dependent X-ray powder diffraction data reveal a first-order structural phase transition at 3 GPa which leads to a distorted monoclinic network and kinked magnetic exchange pathways. In this high-pressure regime, the magnetic ground state switches to Ising-like with concomitant reduction in TN. The related quasi-1D chain, NiI2(3,5-lutidine)4, also forms a tetragonal lattice but consiss of discrete molecular units. A chain-like motif affords close Ni-I...I-Ni contacts and strong magnetic coupling. Evidence suggests that this material is a rare isotropic Haldane chain with J = 17.5 K and D = 6.3 K [2]. Time permitting, structural and magnetic properties of each material will be presented.
[1] Brambleby, et al. PRB 95, 134435 (2017)
[2] Blackmore, et al. in prep.

*NSF DMR-1703003 (EWU), DMR-1157490 (MagLab), DoE, FL, ERC, EPSRC

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Presenters

  • Jamie Manson

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

Authors

  • Jamie Manson

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

  • Jacqueline Villa

    • Chemistry, Eastern Washington University

  • Danielle Villa

    • Chemistry, Eastern Washington University

  • William Blackmore

    • Physics, University of Warwick

  • Robert Williams

    • Physics, University of Warwick

  • Jamie Brambleby

    • Physics, University of Warwick

  • Paul Goddard

    • Physics, University of Warwick
    • Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
    • Warwick University
    • Department of Physics, University of Warwick

  • John Singleton

    • National High Magnetic Field Laboratory, Los Alamos National Laboratory
    • MPA-MAG, Los Alamos National Laboratory
    • National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545
    • Los Alamos National Laboratory
    • NHMFL, Los Alamos National Labs
    • NHMFL, Los Alamos National Laboratory
    • Los Alamos, National High Magnetic Field Laboratory
    • NHMFL, Los Alamos Natl Lab
    • Los Alamos Natl Lab

  • Roger Johnson

    • University of Oxford
    • ISIS Pulsed Neutron Source, Rutherford Appleton Laboratory
    • Clarendon Laboratory, University of Oxford
    • Department of Physics, University of Oxford
    • Physics, University of Oxford

  • Saul H. Lapidus

    • Advanced Photon Source, Argonne National Laboratory
    • X-ray Science Division, Argonne National Laboratory
    • Advanced Photon Source, Argonne Natl Lab

  • Benjamin Huddart

    • Physics, Durham University

  • Thomas Hicken

    • Physics, Durham University

  • Tom Lancaster

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

  • Steve Blundell

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

  • Fan Xiao

    • Muon-spec Lab, Paul Scherrer Institut

  • John Schlueter

    • Division of Material Research, National Science Foundation
    • DMR, NSF