High-TC molecular-based magnets: a ferromagnetic bimetallic chromium(III)-nickel(II) cyanide with TC = 90 K

Gadet, V.; Mallah, Talal; Castro, Isabel; Verdaguer, Michel; Veillet, P.

doi:10.1021/ja00049a078

Cited by 398 publications

(249 citation statements)

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“…2). In Prussian blue analogues, the dependence of T C on the number of neighbours is well-known, as was already reported for several derivatives including Cs x Ni II 4 [Cr III (CN) 6 ] (8+x)/3 as well [5,6,7,8].…”

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confidence: 57%

Vacancy-driven magnetocaloric effect in Prussian blue analogues

Evangelisti¹,

Manuel²,

Affronte

et al. 2007

Journal of Magnetism and Magnetic Materials

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We experimentally show that the magnetocaloric properties of molecule-based Prussian blue analogues can be adjusted by controlling during the synthesis the amount of intrinsic vacancies. For Cs x Ni II 4 [Cr III (CN) 6 ] (8+x)/3 , we find indeed that the ferromagnetic phase transition induces significantly large magnetic entropy changes, whose maxima shift from ∼ 68 K to ∼ 95 K by varying the number of [Cr III (CN) 6 ] 3− vacancies, offering an unique tunability of the magnetocaloric effect in this complex. Magnetic ordering phenomena are efficiently exploited to enhance the magnetocaloric effect (MCE) of magnetic materials [1]. This is possible because the response to the application or removal of magnetic fields is indeed maximized near the ordering temperature. In the search of suitable materials for magneto-cooling applications, however, one may need to adjust the ordering temperature to make optimum use of the magnetocaloric properties of a given material. For conventional materials, such as lanthanide compounds and alloys, it is common practice, in this respect, to partly substitute one constituting element for another one [1]. Here we show that a similar but different strategy can be employed as well in Prussian blue analogues (PBA),

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confidence: 57%

Vacancy-driven magnetocaloric effect in Prussian blue analogues

Evangelisti¹,

Manuel²,

Affronte

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…Data collection: PROCESS-AUTO (Rigaku, 1998); cell refinement: PROCESS-AUTO; data reduction: CrystalStructure (Rigaku, 2007) Curie temperatures (T C ) (Ferlay et al, 1995;Holmes & Girolami, 1999;Hatlevik et al, 1999;Ohkoshi et al, 2000), humidity-response , photomagnetism (Ohkoshi & Hashimoto, 2001;Sato et al, 1996;Ohkoshi et al,1997), and zero thermal expansion (Margadonna et al, 2004 (Ludi et al, 1970;Ludi & Güdel, 1973;Güdel et al, 1973) and et al, 1992;Zeigler et al, 1999;Kato et al, 2003), where M A and M B are transition metal ions and A is an alkali metal ion. Recently, rubidium manganese hexacyanoferrate, Rb x Mn[Fe(CN) 6 ] (x + 2)/3 .zH 2 O, has received attention due to its various functionalities such as a charge-transfer phase transition (Tokoro et al, 2004;Ohkoshi et al, 2005), a pressureinduced magnetic pole inversion (Egan et al, 2006), and a photomagnetic effect .…”

Section: Methodsmentioning

confidence: 99%

“…For general background on Prussian blue compounds, see . For related literature, see: Egan et al (2006); Ferlay et al (1995); Gü del et al (1973); Gadet et al (1992); Hatlevik et al (1999); Holmes & Girolami (1999); Ludi et al (1970); Margadonna et al (2004); Ohkoshi & Hashimoto (2001); Ohkoshi et al (1997Ohkoshi et al ( , 2000Ohkoshi et al ( , 2004Ohkoshi et al ( , 2005; Sato et al (1996); Tokoro et al (2003Tokoro et al ( , 2004; Zeigler et al (1999).…”

Section: Related Literaturementioning

confidence: 99%

Poly[[hexa-μ-cyanido-manganese(II)iron(III)] pentahydrate]

et al. 2008

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Key indicators: single-crystal X-ray study; T = 90 K; mean (Mn-O) = 0.012 Å; Hatom completeness 1%; disorder in main residue; R factor = 0.047; wR factor = 0.136; data-to-parameter ratio = 13.2.The structure of the title compound, Mn II [Fe III (CN) 6 ] 2/3 Á-5H 2 O, features a face-centered cubic -Mn-NC-Fe-framework with both Mn and Fe having site symmetry m3m. Since one-third of the [Fe(CN) 6 ] 3À units are missing for a given formula in order to maintain charge neutrality, each Mn atom around such a vacancy is coordinated not only by the N atoms of the CN groups but also by the O atoms of the ligand water molecules. In addition to ligand water molecules, two types of non-coordinated water molecules, so-called zeolitic water molecules, exist in the interstitial sites of the -Mn-NC-Feframework. The positions of the O atoms of the zeolitic water molecules are fixed by the linkage via hydrogen bonds between ligand water and zeolitic water molecules. The structure is related to a recently reported rubidium manganese hexacyanoferrate. Site occupancy factors for Fe, C, N are 0.67; for two O atoms the value is 0.83 and for one O atom is 0.17. (1997, 2000, 2004, 2005); Sato et al. (1996);Tokoro et al. (2003Tokoro et al. ( , 2004Zeigler et al. (1999). Related literature ExperimentalCrystal data Mn[Fe(CN)

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“…The chosen systems are magnetically soft nanoparticles of formula K 0.22 Ni[Cr(CN) 6 ] 0.74 , from the Prussian blue analogues family. 15,16 They are cubic nanoparticles dispersed in water and can be deposited by simple drop casting on a silicon substrate. Second, the use of the magnetic force microscopy (MFM) working at low-noise conditions (lowtemperature (LT) and pressure).…”

Section: Abstract: Magnetic Vortices Nanoparticles Magnetic Force Mmentioning

confidence: 99%

Switching the Magnetic Vortex Core in a Single Nanoparticle

et al. 2016

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Imaging and manipulating the spin structure of nano-and mesoscale magnetic systems is a challenging topic in magnetism yielding a wide range of spin phenomena as skyrmions, hedgehog-like spin structures or vortices. A key example has been provided by the vortex spin texture, which can be addressed in four independent states of magnetization, enabling the development of multibit magnetic storage media. Most of the works devoted to the study of the magnetization reversal mechanisms of the magnetic vortices have been focused on micronsize magnetic platelets. Here we report the experimental observation of the vortex state formation and annihilation in individual 25 nm molecular-based magnetic nanoparticles measured by low-temperature variable-field magnetic force microscopy (LT-MFM).

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High-TC molecular-based magnets: a ferromagnetic bimetallic chromium(III)-nickel(II) cyanide with TC = 90 K

Cited by 398 publications

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Vacancy-driven magnetocaloric effect in Prussian blue analogues

Vacancy-driven magnetocaloric effect in Prussian blue analogues

Poly[[hexa-μ-cyanido-manganese(II)iron(III)] pentahydrate]

Switching the Magnetic Vortex Core in a Single Nanoparticle

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