Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV2O6

Nandi, M.; Mandal, P.

doi:10.1063/1.4945395

Cited by 24 publications

(27 citation statements)

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“…This state-which emerges also in DMC simulations-gives rise simultaneously to both Bragglike and structured diffuse magnetic scattering, with the Bragg arXiv:1605.02575v1 [cond-mat.dis-nn] 9 May 2016 intensities indistinguishable from those calculated from the multiple-moment models suggested in previous Rietveld studies. The existence of a well-defined 1D state in Tb(HCOO) 3 distinguishes this system from other spin-chain triangular antiferromagnets such as Ca 3 Co 2 O 6 [8,17], CsNiF 3 [29,30] and CoV 2 O 6 [16] and suggests its low-temperature physics may provide a long-sought-after experimental approximant to "true" 1D magnetism.…”

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“…Although the much-studied Ca 3 Co 2 O 6 is conceptually similar to Tb(HCOO) 3 , the key distinction between the two is the orderof-magnitude difference in J /J ⊥ values that stabilises the intermediate-order state in the latter [17]. Nevertheless, as is the case for Ca 3 Co 2 O 6 , Tb(HCOO) 3 is likely to show anomalous response to applied magnetic field; indeed magnetisation plateaux may explain its high performance as a magnetocaloric material [16,25]. From a materials design perspective, the 1D behaviour of Tb(HCOO) 3 is a direct consequence of the underlying MOF architecture.…”

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One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3

et al. 2016

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A combination of variable-temperature neutron scattering, reverse Monte Carlo analysis and direct Monte Carlo simulation is used to characterise the emergence of magnetic order in the metal-organic framework (MOF) Tb(HCOO)3 over the temperature range 100 K to 1.6 K = TN. We show that the magnetic transition at TN involves one-dimensional ferromagnetic ordering to a partially-ordered state related to the triangular Ising antiferromagnet. In this phase, the direction of magnetisation of ferromagnetic chains tends to alternate between neighbouring chains but this alternation is frustrated and is not itself ordered. In neutron scattering measurements this partial order gives rise to Bragg-like peaks, which cannot be interpreted using conventional magnetic crystallography without resort to unphysical spin models. The existence of low-dimensional magnetic order in Tb(HCOO)3 is stabilised by the contrasting strength of inter-and intra-chain magnetic coupling, itself a consequence of the underlying MOF architecture. Our results demonstrate how MOFs may provide an attractive if as yet under-explored platform for the realisation and investigation of low-dimensional physics.Low-dimensional magnets have long provided an important playground for the discovery and exploitation of unconventional physics [1]-from the earliest studies of soliton excitations in CsNiF 3 [2-4] to contemporary research into quantum information transport in spin-chain compounds [5]. The sensitivity of low-dimensional spin systems to small perturbations results in a rich diversity of phase transitions and complex ordering phenomena. By way of example, the Ising spin-chain compound Ca 3 Co 2 O 6 exhibits a variety of equilibrium and non-equilibrium states [6][7][8], characterised by e.g. long-wavelength incommensurate spin density modulations and field-induced magnetisation plateaux reminiscent of Hofstadter fractalisation [9,10]. In the field of low-dimensional magnetism, arguably the strongest scientific interest from both experimental and theoretical perspectives has always been in the limit of strict 1D order [11][12][13][14][15][16]. Yet even in canonical systems such as Ca 3 Co 2 O 6 the divergence of correlation lengths along 1D spin chains is always accompanied by full 3D magnetic order [8,17]. So the realisation and experimental characterisation of genuine partially-ordered low-dimensional spin states remain an important challenge in the field.It was in this context that we chose to study magnetic order in terbium(III) formate, Tb(HCOO) 3 . In metal-organic frameworks (MOFs) such as Tb(HCOO) 3 , magneticallyactive transition-metal or rare-earth ions are connected via organic ligands to form extended 3D framework structures. Because organic ligands can support superexchange interactions that span a broad energy range, and because framework design allows controlled incorporation of low-dimensional structural motifs (e.g. chains, ladders, layers), MOFs are natural candidate hosts for low-dimensional magnetism [18]. Indeed the magnetic response of...

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One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3

et al. 2016

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“…[36,37] It has 1D ferromagnetic intrachain correlations and weaker interchain antiferromagnetic interactions, and at low temperatures orders into longitudinal amplitude-modulated spin-density wave (SDW) propagating along the c-axis. α-CoV 2 O 6 , a 1D Ising ferromagnet, [38] undergoes transitions into different phases under variable applied fields. Studies of this material also showed that it was an excellent magnetocaloric, within it's operating temperature, with a steep magnetisation curve as a result of overcoming the antiferromagnetic interchain correlations into a ferromagnetic state.…”

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Emergent magnetic order and correlated disorder in formate metal-organic frameworks

Dixey

Orlandi

Manuel

et al. 2019

Phil. Trans. R. Soc. A.

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Magnetic materials with strong local interactions but lacking long-range order have long been a curiosity of physicists. Probing their magnetic interactions is crucial for understanding the unique properties they can exhibit. Metal-organic frameworks have recently gathered more attention as they can produce more exotic structures, allowing for controlled design of magnetic properties not found in conventional metal-oxide materials. Historically, magnetic diffuse scattering in such materials has been overlooked but has attracted greater attention recently, with advances in techniques. In this study, we investigate the magnetic structure of metal-organic formate frameworks, using heat capacity, magnetic susceptibility and neutron diffraction. In Tb(DCO 2 ) 3 , we observe emergent magnetic order at temperatures below 1.2 K, consisting of two k -vectors. Ho(DCO 2 ) 3 shows diffuse scattering above 1.6 K, consistent with ferromagnetic chains packed in a frustrated antiferromagnetic triangular lattice, also observed in Tb(DCO 2 ) 3 above 1.2 K. The other lanthanides show no short- or long-range order down to 1.6 K. The results suggest an Ising-like one-dimensional magnetic order associated with frustration is responsible for the magnetocaloric properties, of some members in this family, improving at higher temperatures. This article is part of the theme issue ‘Mineralomimesis: natural and synthetic frameworks in science and technology’.

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“…In this Brief Report we discuss the multi-step behavior in CoV 2 O 6 revealed in Ref. [12] and thoroughly investigated recently [13]. This compound crystallizes in the two allotropic forms [12]: the branneritelike monoclinic structure with the space group C2/m which is schemati- * Electronic address: yu˙kudasov@yahoo.com [14].…”

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The origin of fine structure in magnetization curve of αCoV₂O₆

Kudasov

Kozabaranov

2018

EPJ Web Conf.

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Multiple field-induced plateaus in α-CoV2O6 at low temperatures were revealed earlier by M. Lenertz et al. [J. Phys. Chem. C 115, 17190 (2011)] and carefully investigated recently by M. Nandi and P. Mandal [J. Appl. Phys. 119, 133904 (2016)]. Four equidistant steps were observed in the magnetization curve. We present a model to describe this phenomenon. A magnetic structure of this substance is formed by highly anisotropic triangular lattice of Ising chains running along the b axis. Due to a three-fold degeneracy of three-sublattice magnetic ordering, domain boundaries appear. Their transformation under magnetic field variation leads to two additional steps in the 1/3 magnetization plateau and gives rise to complex magnetic behavior observed experimentally. The domain structure in α-CoV2O6 occurs to be strongly anisotropic because a lifetime of the metastable states depends greatly on the configuration orientation. A strong dependence of the magnetization curve on magnetic field sweep time is predicted.

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Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV2O6

Cited by 24 publications

References 45 publications

One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3

One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3

Emergent magnetic order and correlated disorder in formate metal-organic frameworks

The origin of fine structure in magnetization curve of αCoV₂O₆

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Magnetic and magnetocaloric properties of quasi-one-dimensional Ising spin chain CoV2O6

Cited by 24 publications

References 45 publications

One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3

One-dimensional magnetic order in the metal-organic framework Tb(HCOO)3

Emergent magnetic order and correlated disorder in formate metal-organic frameworks

The origin of fine structure in magnetization curve of αCoV2O6

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The origin of fine structure in magnetization curve of αCoV₂O₆