Geometric Frustration on the Trillium Lattice in a Magnetic Metal-Organic Framework

Abstract

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Magnetocaloric Properties in Rare-Earth-Based Metal–Organic Frameworks: Influence of Magnetic Density and Hydrostatic Pressure

“…Both the enhanced ΔS M and the RCP may originate from a more robust frustration effect for the Gd-LRH structure, since a number of the most important magnetocaloric materials, such as gadolinium gallium garnet, are also strongly frustrated. 41,42 In particular, the enhanced lattice entropy change contribution by applying hydrostatic pressure plays a crucial role in the MCE increase. 40 Therefore, our results demonstrate that the construction of metal−organic framework systems based on high Gd densities may favor magnetocaloric responses that are enhanced at low pressures, thus promoting a new design strategy for efficient cooling devices.…”

Towards frustration in Eu(ii) Archimedean tessellations

“…13,35 Recent results have demonstrated the importance of AF interactions in supplying the large entropy associated with the degenerate ground state in molecule-based systems, while limiting the magnitude of this interaction facilitates full availability of the magnetic entropy upon demagnetization. 35,36 Thus, Eu(II)-based Archimedean tessellations, with their weak and tunable superexchange interactions, may arise as a promising materials class for low temperature refrigeration applications.…”

Anomalous evolution of the magnetocaloric effect in dilute triangular Ising antiferromagnets Tb1−xYx(HCO2Falsaperna1, Bulled2, Stenning3 et al. 2022Phys. Rev. MaterialsSelf Cite0000View full textAdd to dashboardCite

“…2 An important development in the field is the recent appreciation that unconventional magnetic order can play a key role in optimising MCE materials for applications at lower applied fields. [3][4][5][6] Historically, Gd-based magnetocalorics have been favoured because Gd 3+ (S = 7/2) has the largest spin-only maximum magnetic entropy change ΔSm max = Rln(2S + 1) of any magnetic ion. 7 Indeed, a number of Gd-containing oxides and alloys have been reported to show good magnetocaloric properties for low temperature cooling; arguably the most famous is gadolinium gallium garnet (GGG), which is the benchmark material for cooling applications under 10 K. 8 Such materials are, however, often densely-packed structures where strong interactions among the magnetic moments result in the emergence of long-range order at relatively high temperature, commonly restricting their use as magnetocalorics, meaning that they are unsuitable for cooling in lower temperature ranges.…”

“…9,10 The usual focus is on designing structures featuring triangular motifs, which are responsible for the competition of antiferromagnetic interactions; examples include the triangular, kagome and trillium nets. 6,11,12 The Ln(HCO2)3 coordination frameworks (Ln = Gd 3+ , Tb 3+ , Dy 3+ , Ho 3+ , Er 3+ ) comprise one such family of modern MCE materials. 13 These systems have proven to be highly efficient magnetocalorics over a wide temperature range (2-20 K).…”