Pressure induced enhancement of the magnetic ordering temperature in rhenium(IV) monomers

Woodall, Christopher H.; Craig, Gavin A.; Prescimone, Alessandro; Míšek, M.; Cano, Joan; Faus, Juan; Probert, Michael R.; Parsons, Simon; Moggach, Stephen A.; Martı́nez-Lillo, José; Murrie, Mark; Kamenev, K. V.; Brechin, Euan K.

doi:10.1038/ncomms13870

Cited by 37 publications

(29 citation statements)

References 52 publications

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“…7(1) • (2). These structural data are in agreement with those that were previously reported for salts containing the anionic [ReX 6 ] 2− units [27][28][29][30][31][32][33][34][35][36][37][38][39] is approximately 6.52 and 5.93 Å for 1 and 2, respectively. It is worth pointing out that the [ReBr 6 ] 2− anions are arranged in a very similar way in 1, that is, with all of the anionic units orientated in the same direction, whereas the [ReI 6 ] 2− anions display different orientations in the crystal of 2 ( Figure 2).…”

Section: Description Of the Crystal Structuressupporting

confidence: 92%

“…1.0 cm 3 mol −1 K), as previously reported [18]. The decrease of the χMT values observed for complexes 1 and 2 is mainly due to zero-field splitting (ZFS) effects, which are very significant in Re IV -based systems [18,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. A field dependence of the molar magnetisation (M) plot for 1 and 2 at 2.0 K is given in the respective insets of Figure 3a(1),b(2).…”

Section: Magnetic Susceptibilitysupporting

confidence: 76%

“…Both of the compounds exhibit a very similar behaviour that is represented in the form of χ M T versus T plots (χ M being the molar magnetic susceptibility per Re IV ion) for 1 and 2 in Figure 3. At room temperature, the χ M T values are approximately 1.58 (1) and 1.54 cm 3 mol −1 K (2), which fall into the range that was reported for systems containing a magnetically isolated Re IV (S = 3/2 with g = 1.80-1.90) metal ion [18,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Upon cooling, the χ M T values for these compounds decrease first slowly and, around 70-80 K, they decrease faster, reaching minimum values of approximately 0.95 (1) and 0.96 cm 3 mol −1 K (2) at 2.0 K. These minimum values obtained at very low temperature are close to that expected for a magnetically isolated Re IV ion (ca.…”

Section: Magnetic Susceptibilitysupporting

confidence: 63%

“…We have studied further hexahalorhenate(IV) salts of the PPh 4 + cation to develop our investigation in 5d-SIMs. Thus, by means of this bulky cation, the well-known intermolecular Re-X•••X-Re (X = halide ion) interactions, with pathways that can mediate significant magnetic exchanges between neighbouring [ReX 6 ] 2− complexes in the crystal lattice, hence annulling the SIM behaviour of such systems, are avoided [18,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes

et al. 2020

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Two mononuclear ReIV complexes of general formula (PPh4)2[ReX6] [PPh4+ = tetraphenylphosphonium cation, X = Br (1) and I (2)] have been prepared and structurally and magnetically characterised. Both compounds crystallise in the triclinic system with space group Pī. Their structures are made up of hexahalorhenate(IV), [ReX6]2−, anions, and bulky PPh4+ cations. Each ReIV ion in 1 and 2 is six-coordinate and bonded to six halide ions in a quasi regular octahedral geometry. In their crystal packing, the [ReX6]2− anions are well separated from each other through the organic cations, generating alternated anionic and cationic layers, and no intermolecular Re−X···X−Re interactions are present. Variable-temperature dc magnetic susceptibility measurements performed on microcrystalline samples of 1 and 2 show a very similar magnetic behaviour, which is typical of noninteracting mononuclear ReIV complexes with S = 3/2. Ac magnetic susceptibility measurements reveal the slow relaxation of the magnetisation in the presence of external dc fields for 1 and 2, hence indicating the occurrence of the field-induced single-ion magnet (SIM) phenomenon in these hexabromo- and hexaiodorhenate(IV) complexes.

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Section: Description Of the Crystal Structuressupporting

confidence: 92%

Section: Magnetic Susceptibilitysupporting

confidence: 76%

Section: Magnetic Susceptibilitysupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

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Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes

et al. 2020

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“…Similar lattice shrinkage induced magnetic transition has also been reported in many materials under high pressure, which would promote formation of magnetic order. [31][32][33][34] The above results demonstrate that the magnetic transition of CuAgSe pellet at low temperature is induced by structure crossover, which could be related with the reversible phase transition before and after SPS sintering. Therefore, the effect of sintering conditions on the magnetic properties of pellets is investigated.…”

Section: Resultsmentioning

confidence: 99%

First Observation of Low-Temperature Magnetic Transition in CuAgSe

et al. 2018

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In this Article, the temperature-dependent magnetic properties of CuAgSe pellet sintered from surfactant-free CuAgSe nanoparticles synthesized by a wet chemistry method were investigated in the temperature range of 4-300 K. A magnetic transition between diamagnetism and weak ferromagnetism is observed at around 60-70 K. The results from magnetic measurements under different machines/magnetic fields, roomtemperature X-ray photoelectron spectroscopy, and temperature-dependent nuclear magnetic resonance all demonstrate that this magnetic transition is an intrinsic property rather than an effect of impurities. Combining these results with temperature-dependent neutron diffraction, the origin of the weak ferromagnetism is ascribed to a structural crossover-induced canted antiferromagnetism and possible deviation of Cu valence. The transition is strongly dependent on the sintering temperature and pressure, which could induce the structural phase transition. DisciplinesChemistry | Metallurgy | Physical Chemistry ABSTRACT: In this paper, the temperature-dependent magnetic properties of CuAgSe pellet sintered from surfactant-free CuAgSe nanoparticles synthesized by a wet chemistry method were investigated in the temperature range of 4 -300 K. A magnetic transition between diamagnetism and weak ferromagnetism is observed at around 60 -70 K. The results from magnetic measurements under different machines/magnetic fields, room temperature X-ray photoelectron spectroscopy, and temperature dependent nuclear magnetic resonance all demonstrate that this magnetic transition is an intrinsic property rather than an effect of impurities. Combining these results with temperature dependent neutron diffraction, the origin of the weak ferromagnetism is ascribed to a structural crossover induced canted antiferromagnetism and, possible deviation of Cu valence. The transition is strongly dependent on the sintering temperature and pressure, which could induce the structural phase transition.

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Magnetic Anisotropy Control with Curie Temperature above 400 K in a van der Waals Ferromagnet for Spintronic Device

Tang

Huang

et al. 2022

Advanced Materials

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The technological appeal of van der Waals ferromagnetic materials is the ability to control magnetism under external fields with desired thickness toward novel spintronic applications. For practically useful devices, ferromagnetism above room temperature or tunable magnetic anisotropy is highly demanded but remains challenging. To date, only a few layered materials exhibit unambiguous ferromagnetic ordering at room temperature via gating techniques or interface engineering. Here, it is demonstrated that the magnetic anisotropy control and dramatic modulation of Curie temperature (Tc) up to 400 K are realized in layered Fe5GeTe2 via the high‐pressure diamond‐anvil‐cell technique. Magnetic phases manifesting with in‐plane anisotropic, out‐of‐plane anisotropic and nearly isotropic magnetic states can be tuned in a controllable way, depicted by the phase diagram with a maximum Tc up to 360 K. Remarkably, the Tc can be gradually enhanced to above 400 K owing to the Fermi surface evolution during a pressure loading–deloading process. Such an observation sheds light on the understanding and control of emergent magnetic states in practical spintronic applications.

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Pressure induced enhancement of the magnetic ordering temperature in rhenium(IV) monomers

Cited by 37 publications

References 52 publications

Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes

Field-Induced Single-Ion Magnet Phenomenon in Hexabromo- and Hexaiodorhenate(IV) Complexes

First Observation of Low-Temperature Magnetic Transition in CuAgSe

Magnetic Anisotropy Control with Curie Temperature above 400 K in a van der Waals Ferromagnet for Spintronic Device

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