APS Logo

Chemical control of magnetism in <i>S</i> = 1 quantum materials: new twists on a seemingly old theme

Invited

Abstract

We aim to control the spatial exchange and single-ion anisotropies (D) in bespoke S = 1 Ni(II) quantum magnets. Early work led to [Ni(HF2)(pyz)2]SbF6 (pyz = pyrazine) which contains Ni-FHF-Ni chains (JFHF) cross-linked by Ni-pyz-Ni segments (Jpyz) to form a tetragonal network [1]. The material undergoes XY-AFM order below TN = 12.2 K with collinear Ni(II) moments confined to the [Ni(pyz)2]2+ plane. High-field M(H) and inelastic neutron scattering (INS) revealed D ≈ JFHF >> Jpyz. In the related square lattices [2,3], NiX2(pyz)2 (X = F, Cl, Br, I, NCS), the electronegativity of X dictates the Ni(II) spin direction with XY- and Ising-like ground-states observed for X = F, Cl and X = Br, I, NCS, respectively. We used INS to determine Jpyz and J⊥. Chemical substitution of pyz for pyrimidine (pym) affords unusual topologies and enhanced magnetic interactions along Ni-pym-Ni relative to Ni-pyz-Ni. Thus, we synthesized two new Q1D chains: staggered [Ni(pym)(H2O)4]SO4●2H2O and chiral [Ni(pym)(H2O)4]SiF6●H2O, each showing multiple field-induced phase transitions below 5 K. Lastly, we will describe a unique 3D chiral Ni(II) framework that may display spin-liquid behavior at low temperatures. Time permitting, the structural and magnetic properties of these materials will be discussed.

–

Presenters

  • Jamie Manson

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

Authors

  • Jamie Manson

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

  • Jacqueline Villa

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

  • Danielle Y. Villa

    Eastern Washington University

  • Isabel Calderon-Lin

    Eastern Washington University

  • Zachary Manson

    Eastern Washington University

  • Nathan Grinalds

    Eastern Washington University

  • Ashley Sargent

    Eastern Washington University

  • William Blackmore

    Physics, University of Warwick

  • Sam Curley

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

  • Paul Goddard

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

  • John Singleton

    National High Magnetic Field Lab, Los Alamos, Los Alamos National Laboratory, NHMFL, Los Alamos National Laboratory, National High Magnetic Field Laboratory, Los Alamos National Laboratory, NHMFL, Los Alamos National Lab, Los Alamos National Lab.

  • Matthew Stone

    Oak Ridge National Lab, Neutron Scattering Division, Oak Ridge National Laboratory, Quantum Condensed Matter Div, Oak Ridge National Lab, Oak Ridge National Laboratory, Spallation Neutron Source, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Lab, Neutron Scattering Division, OakRidge National Laboratory

  • Roger Johnson

    Physics, University of Oxford

  • Vasile O Garlea

    Oak Ridge National Laboratory, Quantum Condensed Matter Div, Oak Ridge National Lab, Oak Ridge National Lab, Oak Ridge National Lab, Neutron Scattering Division

  • Pascal Manuel

    ISIS Facility, Rutherford Appleton Laboratory-STFC, ISIS Neutron Source, ISIS, STFC RAL, ISIS facility, Rutherford Appleton Laboratory, ISIS, Rutherford Appleton Laboratory, ISIS, Rutherford Appleton Laboratory, UK

  • Craig Brown

    Center of Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST Center for Neutron Research, NIST, Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology, NCNR, NIST