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.

–

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