Spatially anisotropic S=1 square-lattice antiferromagnet with single-ion anisotropy realized in a Ni(II) pyrazine- n,n′ -dioxide coordination polymer
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The Ni(NCS)2(pyzdo)2 coordination polymer is found to be an S=1 spatially anisotropic square lattice with easy-axis single-ion anisotropy. This conclusion is based upon considering in concert the experimental probes x-ray diffraction, magnetic susceptibility, magnetic-field-dependent heat capacity, muon-spin relaxation, neutron diffraction, neutron spectroscopy, and pulsed-field magnetization. Long-range antiferromagnetic (AFM) order develops at TN=18.5K. Although the samples are polycrystalline, there is an observable spin-flop transition and saturation of the magnetization at ≈80T. Linear spin-wave theory yields spatially anisotropic exchanges within an AFM square lattice, Jx=0.235meV, Jy=2.014meV, and an easy-axis single-ion anisotropy D=-1.622meV (after renormalization). The anisotropy of the exchanges is supported by density functional theory.
| Original language | English |
|---|---|
| Article number | 094425 |
| Journal | Physical Review B |
| Volume | 108 |
| Issue number | 9 |
| Number of pages | 19 |
| ISSN | 2469-9950 |
| DOIs | |
| Publication status | Published - 2023 |
Bibliographical note
Funding Information:
This paper has been partially supported by the U.S. DOE. ORNL is managed by UT-Batelle, LLC, under Contract No. DEAC05-00OR22725 with the U.S. DOE. The publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan .
Funding Information:
We thank the late Jamie Lee Manson for invaluable contributions and an enduring passion for coordination-polymer magnetism that continues to inspire us and will forever impact our work. The work at EWU was supported by the National Science Foundation under No. DMR-2104167. D.M.P. and is supported through the Scientific User Facilities Division of the Department of Energy (DOE) Office of Science, sponsored by the Basic Energy Science (BES) Program, DOE Office of Science. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory (ORNL). Muon measurements were carried out at the Swiss Muon Source, Paul Scherrer Institute, and we are grateful for technical support. This paper is funded by EPSRC (UK) Grants No. EP/X025861/1 and No. EP/G003092/1. D.M.P. is thankful for enlightening discussions with Randy Fishman regarding LSWT and Cristian Batista regarding renormalizing LSWT parameters. Data from the UK effort will be made available . A portion of this work was performed at the National High Magnetic Field Laboratory, which is supported by National Science Foundation Cooperative Agreement No. DMR-1644779 and the DOE. J. S. acknowledges support from the DOE BES program “Science at 100 T” and the provision of a Visiting Professorship at Oxford University, both of which permitted the design and construction of much of the specialized equipment used in the high-field studies.
Publisher Copyright:
© 2023 American Physical Society.
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