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Title: Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets

Abstract

Although low-dimensional S = 1 antiferromagnets remain of great interest, difficulty in obtaining high-quality single crystals of the newest materials hinders experimental research in this area. Polycrystalline samples are more readily produced, but there are inherent problems in extracting the magnetic properties of anisotropic systems from powder data. Furthermore, following a discussion of the effect of powder-averaging on various measurement techniques, we present a methodology to overcome this issue using thermodynamic measurements. In particular we focus on whether it is possible to characterise the magnetic properties of polycrystalline, anisotropic samples using readily available laboratory equipment. We test the efficacy of our method using the magnets [Ni(H2O)2(3,5-lutidine)4](BF4)2 and Ni(H2O)2 (acetate)2(4-picoline)2, which have negligible exchange interactions, as well as the antiferromagnet [Ni(H2O)2(pyrazine)2](BF4)2, and show that we are able to extract the anisotropy parameters in each case. We also present a density functional method, which incorporates spin–orbit coupling to estimate the size of the anisotropy in [Ni(H2O)2(pyrazine)2](BF4)2.

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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
European Union, Horizon 2020 Research and Innovation Programme; Royal Society United Kingdom; USDOE Office of Science (SC); European Research Council (ERC); Engineering and Physical Sciences Research Council (EPSRC); National Science Foundation (NSF)
OSTI Identifier:
1561385
Alternate Identifier(s):
OSTI ID: 1577092
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Name: New Journal of Physics Journal Volume: 21 Journal Issue: 9; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; low-dimensional magnetism; magnetism; molecule-based magnets

Citation Formats

Blackmore, W. J. A., Brambleby, J., Lancaster, T., Clark, S. J., Johnson, R. D., Singleton, J., Ozarowski, A., Schlueter, J. A., Chen, Y-S, Arif, A. M., Lapidus, S., Xiao, F., Williams, R. C., Blundell, S. J., Pearce, M. J., Lees, M. R., Manuel, P., Villa, D. Y., Villa, J. A., Manson, J. L., and Goddard, P. A. Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets. United Kingdom: N. p., 2019. Web. doi:10.1088/1367-2630/ab3dba.
Blackmore, W. J. A., Brambleby, J., Lancaster, T., Clark, S. J., Johnson, R. D., Singleton, J., Ozarowski, A., Schlueter, J. A., Chen, Y-S, Arif, A. M., Lapidus, S., Xiao, F., Williams, R. C., Blundell, S. J., Pearce, M. J., Lees, M. R., Manuel, P., Villa, D. Y., Villa, J. A., Manson, J. L., & Goddard, P. A. Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets. United Kingdom. doi:10.1088/1367-2630/ab3dba.
Blackmore, W. J. A., Brambleby, J., Lancaster, T., Clark, S. J., Johnson, R. D., Singleton, J., Ozarowski, A., Schlueter, J. A., Chen, Y-S, Arif, A. M., Lapidus, S., Xiao, F., Williams, R. C., Blundell, S. J., Pearce, M. J., Lees, M. R., Manuel, P., Villa, D. Y., Villa, J. A., Manson, J. L., and Goddard, P. A. Sun . "Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets". United Kingdom. doi:10.1088/1367-2630/ab3dba.
@article{osti_1561385,
title = {Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets},
author = {Blackmore, W. J. A. and Brambleby, J. and Lancaster, T. and Clark, S. J. and Johnson, R. D. and Singleton, J. and Ozarowski, A. and Schlueter, J. A. and Chen, Y-S and Arif, A. M. and Lapidus, S. and Xiao, F. and Williams, R. C. and Blundell, S. J. and Pearce, M. J. and Lees, M. R. and Manuel, P. and Villa, D. Y. and Villa, J. A. and Manson, J. L. and Goddard, P. A.},
abstractNote = {Although low-dimensional S = 1 antiferromagnets remain of great interest, difficulty in obtaining high-quality single crystals of the newest materials hinders experimental research in this area. Polycrystalline samples are more readily produced, but there are inherent problems in extracting the magnetic properties of anisotropic systems from powder data. Furthermore, following a discussion of the effect of powder-averaging on various measurement techniques, we present a methodology to overcome this issue using thermodynamic measurements. In particular we focus on whether it is possible to characterise the magnetic properties of polycrystalline, anisotropic samples using readily available laboratory equipment. We test the efficacy of our method using the magnets [Ni(H2O)2(3,5-lutidine)4](BF4)2 and Ni(H2O)2 (acetate)2(4-picoline)2, which have negligible exchange interactions, as well as the antiferromagnet [Ni(H2O)2(pyrazine)2](BF4)2, and show that we are able to extract the anisotropy parameters in each case. We also present a density functional method, which incorporates spin–orbit coupling to estimate the size of the anisotropy in [Ni(H2O)2(pyrazine)2](BF4)2.},
doi = {10.1088/1367-2630/ab3dba},
journal = {New Journal of Physics},
number = 9,
volume = 21,
place = {United Kingdom},
year = {2019},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1088/1367-2630/ab3dba

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Cited by: 1 work
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    Works referencing / citing this record:

    Near-ideal molecule-based Haldane spin chain
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