Another dimension: investigations of molecular magnetism using muon–spin relaxation

Lancaster, Tom; Blundell, Stephen J.; Pratt, F. L.

doi:10.1088/0031-8949/88/06/068506

Cited by 13 publications

(10 citation statements)

References 62 publications

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“…Molecule-based magnets [1] provide experimental realisations of magnetic spin systems that were, until recently, the sole preserve of theorists [2]. They allow an opportunity to investigate magnetism in low-dimensional systems, the occurrence of quantum critical points, the possible existence of spin liquid states, along with many other phenomena [2].…”

Section: Introductionmentioning

confidence: 99%

Exchange constants in molecule-based magnets derived from density functional methods

2017

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Cu(pyz)(NO3)2 is a quasi one-dimensional molecular antiferromagnet that exhibits three dimensional long-range magnetic order below TN = 110 mK due to the presence of weak inter-chain exchange couplings. Here we compare calculations of the three largest exchange coupling constants in this system using two techniques based on plane-wave basis-set density functional theory: (i) a dimer fragment approach and (ii) an approach using periodic boundary conditions. The calculated values of the large intrachain coupling constant are found to be consistent with experiment, showing the expected level of variation between different techniques and implementations. However, the interchain coupling constants are found to be smaller than the current limits on the resolution of the calculations. This is due to the computational limitations on convergence of absolute energy differences with respect to basis set, which are larger than the inter-chain couplings themselves. Our results imply that errors resulting from such limitations are inherent in the evaluation of small exchange constants in systems of this sort, and that many previously reported results should therefore be treated with caution.

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Section: Introductionmentioning

confidence: 99%

Exchange constants in molecule-based magnets derived from density functional methods

2017

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“…The ratio of A 1 to A 2 was fixed across the temperature range (with A 2 /A 1 ≈ 3) although there is some temperature dependence in the total oscillatory amplitude A 1 + A 2 in our fits. In addition to the two oscillatory components, there is also a small Gaussian contribution (amplitude A 3 and relaxation rate σ) of unknown origin, although such components are commonly found in organic and molecular magnets [26]. These fits allow the extraction of the precession frequencies as a function of temperature, and these are plotted in Figure 3a.…”

Section: µSr Experimentsmentioning

confidence: 99%

“…The technique of muon-spin rotation [22][23][24][25] is very effective in establishing threedimensional ordering in low-dimensional magnets [26,27]. This is because, below the critical temperature, a spontaneous precession of the muon spin-polarization in zeroapplied field can be observed (see e.g., Refs.…”

Section: µSr Experimentsmentioning

confidence: 99%

The Internal Field in a Ferromagnetic Crystal with Chiral Molecular Packing of Achiral Organic Radicals

et al. 2021

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The achiral organic radical dinitrophenyl nitronyl nitroxide crystallizes in two enantiomorphs, both being chiral tetragonal space groups that are mirror images of each other. Muon-spin rotation experiments have been performed to study the magnetic properties of these crystals and demonstrate that long-range magnetic order is established below a temperature of 1.10(1) K. Two oscillatory components are detected in the muon data, which show two different temperature dependences.

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“…The condition 0 < J J holds for the quasi-2D antiferromagnets, and 0 < 1 for the weakly XY -like interaction. Organic molecular-based antiferromagnets have been a good test bed to study 2D spin systems because J, J , and can be controlled with various ligands or anions [6,21,22]. Another advantage of these compounds is the small energy scale of the exchange interactions, which makes it easy using laboratory magnets to reach a saturation field or to control the anisotropy by generating effective field-induced anisotropy H larger than the intrinsic anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [CuCl(pyz)2]BF4

et al. 2019

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We measured NMR and magnetic susceptibility for the quasi-two-dimensional, weakly XY-like, spin-1/2 square-lattice Heisenberg antiferromagnet [CuCl(pyz) 2 ]BF 4 (pyz = pyrazine = N 2 C 4 H 4) near the critical temperature. The Néel temperature T N and the order-parameter critical exponent β were obtained from the NMR line broadening as a function of temperature. As the applied field strength (H c) was increased, T N increased and β decreased. This behavior indicates that the field effectively enhanced XY anisotropy. The susceptibility as a function of temperature did not show a clear feature for T N , but showed field-dependent minima below T N for both H c and H ab, where minimum features disappeared for μ 0 H > 2 T.

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Another dimension: investigations of molecular magnetism using muon–spin relaxation

Cited by 13 publications

References 62 publications

Exchange constants in molecule-based magnets derived from density functional methods

Exchange constants in molecule-based magnets derived from density functional methods

The Internal Field in a Ferromagnetic Crystal with Chiral Molecular Packing of Achiral Organic Radicals

Field-induced anisotropy in the quasi-two-dimensional weakly anisotropic antiferromagnet [CuCl(pyz)2]BF4

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