Magnetic ground state of the two isostructual polymeric quantum magnets<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>[</mml:mo><mml:mi>Cu</mml:mi><mml:mo>(</mml:mo><mml:msub><mml:mi>HF</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo>)</mml:mo><mml:mo>(</mml:mo><mml:mtext>pyrazine</mml:mtext><mml:msub><mml:mo>)</mml:mo><mml:mn>2</mml:mn></mml:msub><mml:mo>]</mml:mo><mml:msub><mml:mi>SbF</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML

Brambleby, Jamie; Goddard, Paul; Johnson, Roger A.; Liu, Junjie; Kaminski, Danielle; Ardavan, Arzhang; Steele, Andrew J.; Blundell, Stephen J.; Lancaster, Tom; Manuel, Pascal; Baker, Peter J.; Singleton, John; Schwalbe, Sebastian; Spurgeon, Peter M.; Tran, Hope E.; Peterson, Peter K.; Corbey, Jordan F.; Manson, Jamie L.

doi:10.1103/physrevb.92.134406

Cited by 11 publications

(10 citation statements)

References 42 publications

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“…2c) was applied, yielding the effective magnetic moment of P eff = 5.66(1) μ B and the Weiss temperature of θ = -20.6(1) K. The negative Weiss constant indicates that the dominant magnetic interaction in 1 is AFM, which is also moderately-strong for S = 3/2. The larger P eff suggests unquenched orbital contribution, which have been usually observed in other reported Co 2+ compounds [34,[37][38][39]. Compared with the theoretical value of 5.40 μ B for spin and orbital angular momenta, the high anisotropy (g > 2) may be proposed in the 1D chain structure of 1 based on the large value of P eff .…”

Section: Magnetic Propertiesmentioning

confidence: 50%

“…The energy levels ( T 1g , unquenched orbital contribution is exhibited [35]. Thus, larger effective magnetic moments are usually observed experimentally in the compounds with Co 2+ in high spin state [34,[37][38][39]. Consistently, the effective magnetic moment P eff in 1 in this work is produced as 5.66 μ B from the magnetic susceptibility date in the high temperature region, which is reasonably expected to be larger than the spin only value of 3.87 μ B for free high spin state of Co 2+ .…”

Section: Discussionmentioning

confidence: 90%

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Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

Wang

Liu

et al. 2019

Sci. China Mater.

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A new one-dimensional (1D) antiferromagnetic transition metal hybrid fluoride CoF 2 (H 2 O) 2 (pyz) (pyz = pyrazine) together with two new isostructural MF 2 (H 2 O) 2 (pyz) (M = Ni 2+ , Zn 2+ ) have been successfully synthesized by the hydrothermal method. Their structures were determined by single crystal X-ray diffraction and they all crystallize in the same space group of C2/m. The magnetic property of CoF 2 (H 2 O) 2 (pyz) 1 was measured and discussed. The Weiss constant of −20.6 K indicates dominant antiferromagnetic interaction and the effective magnetic moment of about 5.66 μ B suggests large unquenched orbital contribution and anisotropy in 1. The quantum fluctuations in the quasi-1D antiferromagnet of 1 prevent the appearance of long range magnetic order until 2.9 K, suggesting good 1D magnetism.

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Section: Magnetic Propertiesmentioning

confidence: 50%

Section: Discussionmentioning

confidence: 90%

Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

Wang

Liu

et al. 2019

Sci. China Mater.

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“…Clearly it is not sufficient to curb the interlayer coupling alone; even in S = 1/2 systems efforts must be taken to suppress any intralayer magnetic anisotropy. We point out that for the related material [Cu(HF 2 )(pyz) 2 ]SbF 6 it was not possible to detect any spin-exchange anisotropy using either magnetometry or neutron diffraction down to the lowest temperature measured 76 , suggesting that the observed transition to longrange order is driven predominantly by interlayer coupling. That material, unlike the systems considered here, has tetragonal structural symmetry in the ordered phase, and it is probable that the magnetic anisotropy we observe in our materials is linked to their reduced structural symmetry.…”

Section: Discussionmentioning

confidence: 96%

Control of the third dimension in copper-based square-lattice antiferromagnets

et al. 2016

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Using a mixed-ligand synthetic scheme, we create a family of quasi-two-dimensional antiferromagnets, namely, [Cu(HF2)(pyz)2]ClO4 [pyz = pyrazine], [CuL2(pyz)2](ClO4)2 [L = pyO = pyridine-N-oxide and 4-phpyO = 4-phenylpyridine-N-oxide. These materials are shown to possess equivalent two-dimensional [Cu(pyz)2] 2+ nearly square layers, but exhibit interlayer spacings that vary from 6.5713Å to 16.777Å, as dictated by the axial ligands. We present the structural and magnetic properties of this family as determined via x-ray diffraction, electron-spin resonance, pulsed-and quasistatic-field magnetometry and muon-spin rotation, and compare them to those of the prototypical two-dimensional magnetic polymer Cu(pyz)2(ClO4)2. We find that, within the limits of the experimental error, the two-dimensional, intralayer exchange coupling in our family of materials remains largely unaffected by the axial ligand substitution, while the observed magnetic ordering temperature (1.91 K for the material with the HF2 axial ligand, 1.70 K for the pyO and 1.63 K for the 4-phpyO) decreases slowly with increasing layer separation. Despite the structural motifs common to this family and Cu(pyz)2(ClO4)2, the latter has significantly stronger two-dimensional exchange interactions and hence a higher ordering temperature. We discuss these results, as well as the mechanisms that might drive the long-range order in these materials, in terms of departures from the ideal S = 1/2 two-dimensional square-lattice Heisenberg antiferromagnet. In particular, we find that both spin exchange anisotropy in the intralayer interaction and interlayer couplings (exchange, dipolar, or both) are needed to account for the observed ordering temperatures, with the intralayer anisotropy becoming more important as the layers are pulled further apart.

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“…This observed full moment precludes strong quantum fluctuations in the ground state which were prominent in the Q2D Heisenberg S = 1 2 Cu(II) congener, for which a reduced ordered moment of 0.6(1)µ B was found 35 . The differing results can be attributed to the smaller spin-quantum number and strong quantum fluctuations, the significantly smaller J /J ratio, and the lack of single-ion anisotropy in the copper material.…”

Section: (B)mentioning

confidence: 91%

Combining microscopic and macroscopic probes to untangle the single-ion anisotropy and exchange energies in an S=1 quantum antiferromagnet

et al. 2017

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. (2017) Combining microscopic and macroscopic probes to untangle the single-ion anisotropy and exchange energies in an S=1 quantum antiferromagnet. Physical Review B (Condensed Matter and Materials Physics), 95 (13). 134435. Permanent WRAP URL:http://wrap.warwick.ac.uk/87422 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented in WRAP is the published version or, version of record, and may be cited as it appears here.For more information, please contact the WRAP Team at: wrap@warwick.ac.ukCombining micro-and macroscopic probes to untangle single-ion anisotropy and exchange energies in a S = 1 quantum antiferromagnet The magnetic ground state of the quasi-one-dimensional spin-1 antiferromagnetic chain is sensitive to the relative sizes of the single-ion anisotropy (D) and the intrachain (J) and interchain (J ) exchange interactions. The ratios D/J and J /J dictate the material's placement in one of three competing phases: a Haldane gapped phase, a quantum paramagnet and an XY -ordered state, with a quantum critical point at their junction. We have identified [Ni(HF)2(pyz)2]SbF6, where pyz = pyrazine, as a rare candidate in which this behavior can be explored in detail. Combining neutron scattering (elastic and inelastic) in applied magnetic fields of up to 10 tesla and magnetization measurements in fields of up to 60 tesla with numerical modeling of experimental observables, we are able to obtain accurate values of all of the parameters of the Hamiltonian [D = 13.3(1) K, J = 10.4(3) K and J = 1.4(2) K], despite the polycrystalline nature of the sample. Densityfunctional theory calculations result in similar couplings (J = 9.2 K, J = 1.8 K) and predict that the majority of the total spin population resides on the Ni(II) ion, while the remaining spin density is delocalized over both ligand types. The general procedures outlined in this paper permit phase boundaries and quantum-critical points to be explored in anisotropic systems for which single crystals are as yet unavailable.

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Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6and
Jamie Brambleby
¹
,
Paul Goddard
²
,
Roger A. Johnson
³

et al.

Cited by 11 publications

References 42 publications

Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

Control of the third dimension in copper-based square-lattice antiferromagnets

Combining microscopic and macroscopic probes to untangle the single-ion anisotropy and exchange energies in an S=1 quantum antiferromagnet

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Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6andJamie Brambleby1, Paul Goddard2, Roger A. Johnson3 et al.

Cited by 11 publications

References 42 publications

Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

Synthesis and characterization of a new quasi-one-dimensional antiferromagnet CoF2(H2O)2(pyrazine)

Control of the third dimension in copper-based square-lattice antiferromagnets

Combining microscopic and macroscopic probes to untangle the single-ion anisotropy and exchange energies in an S=1 quantum antiferromagnet

Contact Info

Product

Resources

About

Magnetic ground state of the two isostructual polymeric quantum magnets[Cu(HF2)(pyrazine)2]SbF6and
Jamie Brambleby
¹
,
Paul Goddard
²
,
Roger A. Johnson
³

et al.