Molecular Engineering for Single‐Chain‐Magnet Behavior in a One‐Dimensional Dysprosium–Nitronyl Nitroxide Compound

Bogani, Lapo; Sangregorio, Claudio; Sessoli, Roberta; Gatteschi, Dante

doi:10.1002/anie.200500464

Cited by 440 publications

(191 citation statements)

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“…1, confirms the results obtained in Ref. 23, where in an applied field of H ¼ 100 Oe a minimum at T $ 8.6 K and a rounded peak at T peak $ 3.6 K were observed. As can be easily seen from Fig.…”

Section: Experimental Details Results and Discussionsupporting

confidence: 91%

“…23. To investigate the magnetic properties of the sample, we performed magnetization measurements with a MDMS-XL7 Quantum Design magnetometer, in the temperature range of 2-300 K in constant magnetic fields of H ¼ 5, 3500, and 16500 Oe under field cooling (FC) conditions.…”

Section: Experimental Details Results and Discussionmentioning

confidence: 99%

“…10,13 Subsequently, several other compounds were shown to exhibit SCM behavior, 11,[14][15][16][17][18][19][20][21] with quantum effects influencing the magnetization dynamics at low temperatures. 22 In particular, several works [23][24][25] showed that the requirements necessary to observe Glauber dynamics-a strong Ising-like anisotropy and a very low ratio of interchain/intrachain magnetic exchange interactions-are fulfilled in [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] (in short DyPhOPh). A previous theoretical and experimental study 25 demonstrated that DyPhOPh consists of two sets of non-interacting parallel chains, with projections mutually tilted by about 90…”

Section: Introductionmentioning

confidence: 99%

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Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Arosio

Corti

Mariani

et al. 2015

Journal of Applied Physics

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Articles you may be interested inLocal spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A l 1 spin relaxation study The spin dynamics of the molecular magnetic chain [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] were investigated by means of the Muon Spin Relaxation (l þ SR) technique. This system consists of a magnetic lattice of alternating Dy(III) ions and radical spins, and exhibits single-chain-magnet behavior. The magnetic properties of [Dy(hfac) 3 {NIT(C 6 H 4 OPh)}] have been studied by measuring the magnetization vs. temperature at different applied magnetic fields (H ¼ 5, 3500, and 16500 Oe) and by performing l þ SR experiments vs. temperature in zero field and in a longitudinal applied magnetic field H ¼ 3500 Oe. The muon asymmetry P(t) was fitted by the sum of three components, two stretched-exponential decays with fast and intermediate relaxation times, and a third slow exponential decay. The temperature dependence of the spin dynamics has been determined by analyzing the muon longitudinal relaxation rate k interm (T), associated with the intermediate relaxing component. The experimental k interm (T) data were fitted with a corrected phenomenological BloembergenPurcell-Pound law by using a distribution of thermally activated correlation times, which average to s ¼ s 0 exp(D/k B T), corresponding to a distribution of energy barriers D. The correlation times can be associated with the spin freezing that occurs when the system condenses in the ground state. V C 2015 AIP Publishing LLC. [http://dx

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Section: Experimental Details Results and Discussionsupporting

confidence: 91%

Section: Experimental Details Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Arosio

Corti

Mariani

et al. 2015

Journal of Applied Physics

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“…M can be a transition-metal (TM) or a rare-earth (RE) ion [8][9][10], while in NITR possible choices are R=ethyl (Et), isopropyl (iPr), methyl (Me), or phenyl (Ph). The case where the magnetic ion is a rare earth assumes a particular interest, because the ground state can range from nonmagnetic (M = Eu 3+ , Y 3+ ) to isotropic (M = Gd 3+ ) to strongly anisotropic (M = Dy 3+ ) [8,11]. Furthermore, by * alessandro.lascialfari@unimi.it inserting different radicals R in a rare-earth-based chain, one can obtain a family of quasi-1D helimagnets, M(hfac) 3 NITR (hfac= hexafluoroacetylacetonate), with different degrees of frustration arising from the competing intrachain magnetic interactions between nearest-neighbor (nn) and next-nearestneighbor (nnn) magnetic centers [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Proton NMR study of spin dynamics in the magnetic organic chainsM(hfac)3NITEt(M=Eu3+

et al. 2016

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In this work, we present a nuclear magnetic resonance (NMR) study of the spin dynamics in the rare-earth-based low-dimensional molecular magnetic chains Eu(hfac) 3 NITEt and Gd(hfac) 3 NITEt (in short, Eu-Et and Gd-Et). Although both samples are based on the same chemical building block, [(hfac) 3 NITEt], their magnetic properties change dramatically when the Eu 3+ ion, which is nonmagnetic at low temperatures, is substituted by the magnetic Gd 3+ ion. The present proton NMR investigation shows that, down to the lowest investigated temperature (T = 1.5 K for Gd-Et and T = 3 K for Eu-Et), the Eu-Et chain behaves as a one-dimensional Heisenberg model with antiferromagnetic exchange coupling (J = −20 K) between s = 1/2 organic radicals, and has a T -independent exchange frequency (ω e = 2.6 × 10 12 rad/s). In the Gd-Et chain, in contrast, a competition arises between nearest-neighbor ferromagnetic coupling and next-nearest-neighbor antiferromagnetic coupling; moreover, two phase transitions have previously been found, in agreement with Villain's conjecture: a first transition, at T 0 = 2.2 K, from a high temperature paramagnetic phase to a chiral spin liquid phase, and a second transition, at T N = 1.9 K, to a three-dimensional helical spin solid phase. Contrary to the Eu-Et chain (whose three-dimensional ordering temperature is estimated to insurge at very low, T N ≈ 0.3 K), critical spin dynamics effects have been measured in the Gd-Et chain on approaching T N = 1.9 K: namely, a divergence of the proton nuclear spin-lattice relaxation rate 1/T 1 , which in turn produces a sudden wipe-out of the NMR signal in a very narrow ( T ∼ 0.04 K) temperature range above T N . Below T N , an inhomogeneous broadening of the NMR line indicates a complete spin freezing. At T 0 = 2.2 K, instead, such critical effects are not observed because NMR measurements probe the two-spin correlation function, while the chiral spin liquid phase transition is associated with a divergence of the four-spin correlation function.

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“…Reasonably satisfactory energetics description of such systems can be obtained by the elegant broken-symmetry (BS) method [18][19][20][21]. Let us mention that, in particular, BS density functional theory (DFT) calculations have turned out to be very efficient in the determination of magnetic coupling constants and EPR parameters (see [22][23][24][25][26][27][28][29] and references therein). On the other hand, the DFT methodology has been extensively used in surface science to follow at a microscopic level the reactant transformation leading to products.…”

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confidence: 99%

From Hartree–Fock to Electron Correlation: Application to Magnetic Systems

Robert

Képénékian²,

Rota

et al. 2009

Computational Methods in Catalysis and Materials Science

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Molecular Engineering for Single‐Chain‐Magnet Behavior in a One‐Dimensional Dysprosium–Nitronyl Nitroxide Compound

Cited by 440 publications

References 36 publications

Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Local spin dynamics at low temperature in the slowly relaxing molecular chain [Dy(hfac)3{NIT(C6H4OPh)}]: A μ+ spin relaxation study

Proton NMR study of spin dynamics in the magnetic organic chainsM(hfac)3NITEt(M=Eu3+

From Hartree–Fock to Electron Correlation: Application to Magnetic Systems

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