Pressure effect on the magnetism of layered copper(II) compounds with interlayer spacing up to 40.7 Å: Nature of the magnetic ordering

Drillon, Marc; Panissod, P.; Rabu, Pierre; Souletie, J.; Ksenofontov, Vadim; Gütlich, Philipp

doi:10.1103/physrevb.65.104404

Cited by 70 publications

(57 citation statements)

References 19 publications

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“…This minimum is well fitted by the superposition of two exponentials: a high-temperature AF contribution which vanishes at absolute zero, and a low temperature ferromagnetic one, describing the strong variation in the temperature range 50±300 K. Note that the latter is fully justified for a 2D Heisenberg ferromagnet, whose low-temperature behavior is given by vT = exp(4pJS 2 /kT) [86] where J is the in-plane exchange constant. Therefore, the data have been fitted with the expression: [87] vT = C 1 exp(aJ/kT) + C 2 exp(bJ/kT)…”

Section: Influence Of Organic Spacersmentioning

confidence: 99%

“…here the behavior of the copper(II) hydroxide-based compounds in the framework of the scaling theory of phase transitions. [92] This theory assumes that length of the spin correlations diverges like n = n 0 (1-T c /T) ±c , wherefrom it follows that the vT product may be written as: [87] vT = C (1-T c /T) ±c = C(1-T c /T) ±h/Tc with h = cT c where C is the high temperature Curie constant. Near T c , when n diverges, the exponent c takes universal values which only depend on the spin and space dimensions.…”

Section: Origin Of the Phase Transitionmentioning

confidence: 99%

“…This equation is linearized around <l> = 0, and we then deduce the implicit expression for T C : [87] T C = n 2 lH dip (T C )/3k…”

Section: Reviewsmentioning

confidence: 99%

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Layered Organic–Inorganic Materials: A Way towards Controllable Magnetism

2003

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The search for new materials for tailor‐made applications and new devices involves not only solid‐state chemists, physicists or materials engineers, but also the area molecular and organo‐metallic chemistry, and even biochemistry. This is especially clear in the field of organic–inorganic multifunctional materials, whose design necessitates to investigate new concepts and principles developed in these different disciplines. Here, the authors review the structure‐magnetic property relationships in layered structures, made of organic and inorganic subunits.

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Section: Influence Of Organic Spacersmentioning

confidence: 99%

Section: Origin Of the Phase Transitionmentioning

confidence: 99%

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Layered Organic–Inorganic Materials: A Way towards Controllable Magnetism

2003

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“…To rationalize this evolution, Equation 2 is used to describe the magnetic behavior. [18] xT ¼ C 1 expðaJ=k B TÞ þ C 2 expðbJ=k B TÞ…”

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Néel Temperature Enhancement by Increasing the In‐plane Magnetic Correlation in Layered Inorganic–Organic Hybrid Materials

et al. 2008

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Magnets with controllable and/or switchable properties are an important topic in modern molecular chemistry.[1] Research in this area led to the discovery of hybrid organic-inorganic multilayer magnets, [2] which have attracted intense interest for several motivations: i) to combine with other important modulatable physical properties, ii) to provide archetype low-dimensional magnets, and iii) to promote cooperation between the inorganic and organic components on magnetic control. [2] Nice examples are provided by the families of metal oxalates, i.e., ferro-, ferri-, or canted antiferromagnetic inorganic layers that are separated by conductive organic radicals, [3] metal phosphonates, [4] and layered metal hydroxides M 2 (OH) 3 X (M --Cu As indicated by theory, dipole-dipole interactions between the layers can lead to the establishment of long-range magnetic order in two dimensions, [5] and the critical temperature, T C , is mainly dependent on the in-plane magnetic correlation, j, which gives rise to the relationship shown in Equation 1:where J is the in-plane ferromagnetic interaction. From this relationship, one can see that j is mainly dependent on J and S.[6] Pioneering studies on this relationship have involved the family of M 2 (OH) 3 X. Investigations mainly focused on exchanging X on the fixed M 2 (OH) 3 plane, and showed that T C is less affected by the interlayer distance.[2] A further question that needs to be answered is the effect of variation of the inorganic layer on T C .However, the in-plane magnetic dimension seems somewhat difficult to control by using only one ligand. Our previous work on the cobalt(II) ion and the trans-cyclohexane-1,2-dicarboxylate (trans-1,2-chdc) ligand demonstrates that the in-plane magnetic correlation can be changed from twodimensional (2D) Co It is worth noting that the solvent-dependent conformations of cyclohexane-1,2-dicarboxylate (1,2-chdc) observed in 1 and 2 are interesting. Density functional theory (DFT) calculations show that the cis and trans conformations are thermally more stable in basic and acidic conditions, respectively (Scheme S1).[8] However, regardless of whether the environment is basic or acidic, the difference in the energy is only 5 kJ Á mol À1 , which suggests that the reaction kinetics would be critical for the conformation of the product. Therefore, different solvents were used to control the conformations, and it was found that no matter what conformer was used initially, i.e., cis-or trans-1,2-chdc, water led to the trans conformation in 1, while ethylene glycol led to the cis conformation in 2, even with a reaction temperature of up to 190 8C. Such a solvent effect on the conformation of 1,2-chdc is unprecedented, and is different to previous studies on the analogous cyclohexane-1,4-dicarboxylate [9] and cyclohex-4-ene-1,2-dicarboxylate, [10] which exhibit cis and trans conformations at low and high reaction temperatures, respectively. Single-crystal X-ray diffraction reveals that all four independent 1,2-chdc ligands in 1 are ...

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“…On the other hand, interesting studies have been performed on 2D systems with different intraand interlayer magnetic interactions. 2,3 Previous studies by Kahn and co-workers in designing molecule-based magnets have shown that organizing ferromagnetic arrangements in extended 2D or 3D systems is quite a difficult task. 1 The choice of a specifically tailored building block is crucial in the design of systems with tunable dimensionality displaying ferromagnetic coupling.…”

mentioning

confidence: 99%

Metamagnetism in hydrophobically induced carboxylate (phenylmalonate)-bridged copper(ii) layers

et al. 2006

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Self-assembly of copper(II) ions, phenylmalonate and pyrimidine yields the layered compound [Cu(pym)(Phmal)] n (1) where intralayer ferro-and interlayer antiferromagnetic interactions occur with three-dimensional antiferromagnetic ordering at T c = 2.15 K.The construction of multidimensional magnetic materials with magnetic ordering is one of the major challenges in magnetochemistry. 1 For such a purpose, the construction of three-dimensional (3D) systems is a good approach, but a deep study of the nature and intensity of the coupling among the paramagnetic centres in these systems is precluded due to the lack of theoretical models to analyze the magnetic ordered state. On the other hand, interesting studies have been performed on 2D systems with different intraand interlayer magnetic interactions. 2,3 Previous studies by Kahn and co-workers in designing molecule-based magnets have shown that organizing ferromagnetic arrangements in extended 2D or 3D systems is quite a difficult task. 1 The choice of a specifically tailored building block is crucial in the design of systems with tunable dimensionality displaying ferromagnetic coupling.The malonate-bridged copper(II) complexes show a wide variety of molecular architectures which exhibit ferromagnetic coupling in most cases. [4][5][6][7][8] In previous studies with these compounds, we have observed that the insertion of additional groups in the malonate skeleton (for instance, a phenyl group) modifies the supramolecular interactions and the dimensionality of the coordination polymer, but the ferromagnetic nature of the magnetic coupling is kept as in the compound [Cu(H 2 O) 3 ][Cu(Phmal) 2 ] (H 2 Phmal = phenylmalonic acid). 9 The use of potentially bridging nitrogen donor heterocycles as coligands has proved to be very appealing because of the construction of supramolecular motifs with varied functions. [10][11][12][13] In the present work, we focus on the structure and variable-temperature magnetic study of the layered compound [Cu(pym)(Phmal)] n (1) (pym = pyrimidine) together with a brief analysis of the supramolecular effects that determine its twodimensional structure. The compound has a metamagnetic behaviour due to the coexistence of intralayer ferromagnetic and interlayer antiferromagnetic interactions, the critical magnetic field being H c = 130 G.

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Pressure effect on the magnetism of layered copper(II) compounds with interlayer spacing up to 40.7 Å: Nature of the magnetic ordering

Cited by 70 publications

References 19 publications

Layered Organic–Inorganic Materials: A Way towards Controllable Magnetism

Layered Organic–Inorganic Materials: A Way towards Controllable Magnetism

Néel Temperature Enhancement by Increasing the In‐plane Magnetic Correlation in Layered Inorganic–Organic Hybrid Materials

Metamagnetism in hydrophobically induced carboxylate (phenylmalonate)-bridged copper(ii) layers

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