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

Blackmore, WJA; Brambleby, J; Lancaster, T; Clark, SJ; Johnson, RD; Singleton, J; Ozarowski, A; Schlueter, JA; Chen, Y-S; Arif, AM; Lapidus, S; Xiao, F; Williams, RC; Blundell, SJ; Pearce, MJ; Lees, MR; Manuel, P; Villa, DY; Villa, JA; Manson, JL; Goddard, PA

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


Authors

WJA Blackmore

J Brambleby

SJ Clark

RD Johnson

J Singleton

A Ozarowski

JA Schlueter

Y-S Chen

AM Arif

S Lapidus

F Xiao

RC Williams

SJ Blundell

MJ Pearce

MR Lees

P Manuel

DY Villa

JA Villa

JL Manson

PA Goddard



Abstract

Although low-dimensional S = 1 antiferromagnets remain of great interest, difficulty in obtaining highquality 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 systemsfrom powder data. 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 wefocus 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. The results obtainedfrom the thermodynamic measurements are checked against electron-spin resonance and neutron diffraction.We also present a densityfunctional method, which incorporates spin–orbit coupling to estimate the size of the anisotropy in [Ni(H2O)2(pyrazine)2](BF4)2.

Citation

Blackmore, W., Brambleby, J., Lancaster, T., Clark, S., Johnson, R., Singleton, J., …Goddard, P. (2019). Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets. New Journal of Physics, 21(9), https://doi.org/10.1088/1367-2630/ab3dba

Journal Article Type Article
Acceptance Date Aug 22, 2019
Online Publication Date Sep 12, 2019
Publication Date Sep 30, 2019
Deposit Date Sep 16, 2019
Publicly Available Date Oct 15, 2019
Journal New Journal of Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 21
Issue 9
DOI https://doi.org/10.1088/1367-2630/ab3dba

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