Structural, electronic and hyperfine characterization of pure and Ta-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ZrSi</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Alonso, R. E.; Errico, L. A.; Taylor, Marcela Andrea; Svane, A.; Christensen, N. E.

doi:10.1103/physrevb.91.085129

Cited by 10 publications

(15 citation statements)

References 42 publications

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“…24 SG behavior clearly governed by dipolar interactions has been observed in random closed packed (RCP) samples of highly monodisperse maghemite (γF e 2 O 3 ) NP. 25,26 Recent Monte Carlo (MC) simulations of diluted systems of either parallel [27][28][29] or randomly oriented Ising dipoles 30 exhibited the existence of a SG phase at temperatures below a transition temperature T sg . Moreover, MC data are consistent with quasi-long-range 31 order in the SG phase.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, MC data are consistent with quasi-long-range 31 order in the SG phase. 28,29 Neither the droplet model 32 nor a replica symmetry breaking (RSB) scenario 33 fit in with this marginal behavior. Previous MC work for a fully occupied simple cubic (SC) lattice of dipoles with randomly oriented axes 34 also found a SG phase, but nei-ther clear-cut results about the nature of the SG phase were obtained, nor was it possible to discern between the above mentioned scenarios.…”

Section: Introductionmentioning

confidence: 99%

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Nature of the spin-glass phase in dense packings of Ising dipoles with random anisotropy axes

Alonso¹,

Allés²

2017

J. Phys.: Condens. Matter

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Using tempered Monte Carlo simulations, we study the the spin-glass phase of dense packings of Ising dipoles pointing along random axes. We consider systems of dipoles (i) placed on the sites of a simple cubic lattice with lattice constant d, and (ii) placed at the center of random close packed spheres of diameter d that occupy 64% of the volume. For both cases, we find a spin-glass phase below a certain temperature T . By analysing the data obtained for the overlap parameter, the associated correlation length, as well as the statistics of the overlap distributions of individual samples, we find a behavior consistent with quasi-long-range order in the spin-glass phase, similar to the one previously found in strongly diluted dipolar systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nature of the spin-glass phase in dense packings of Ising dipoles with random anisotropy axes

Alonso¹,

Allés²

2017

J. Phys.: Condens. Matter

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“…In order to test the value thus obtained for t 0 , we observed that a second overlapq(t 0 , t 0 + t) calculated for pairs of configurations of a single replica taken at times t 0 and t 0 + t remains stuck to q 0 as t increases. 30 It is found that the less textured the system is, the longer the equilibration time appears. This is due to the large roughness of the free-energy landscapes for non-textured systems.…”

Section: 29mentioning

confidence: 99%

Phase diagram for ensembles of random close-packed Ising-like dipoles as a function of texturation

2019

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We study random close packed systems of magnetic spheres by Monte Carlo simulations in order to estimate their phase diagram. The uniaxial anisotropy of the spheres makes each of them behave as a single Ising dipole along a fixed easy axis. We explore the phase diagram in terms of the temperature and the degree of alignment (or texturation) among the easy axes of all spheres. This degree of alignment ranges from the textured case (all easy axes pointing along a common direction) to the non-textured case (randomly distributed easy axes). In the former case we find long-range ferromagnetic order at low temperature but, as the degree of alignment is diminished below a certain threshold, the ferromagnetic phase gives way to a spin-glass phase. This spin-glass phase is similar to the one previously found in other dipolar systems with strong frozen disorder. The transition between ferromagnetism and spin-glass passes through a narrow intermediate phase with quasi-long-range ferromagnetic order.

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“…The dipolar Ising model with random distribution of Ising axes, the random axes dipoles model (RAD) 14,25 , is known to present a spin-glass (SG) ordered phase at low temperature. On an other hand, the totally oriented dipolar Ising model, parallel axes dipoles model (PAD) [26][27][28][29] presents a long range ferromagnetic (or antiferromagnetic for the simple cubic lattice) phase when the concentration of occupied sites takes a value larger than a threshold one (x c ≃ 0.65 on the simple cubic lattice). Klopper et al 26 have considered a dipolar Ising model on a FCC lattice with a random exchange term as source of disorder.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of a three-dimensional dipolar Ising model with textured Ising axes

Russier¹,

Alonso²

2020

J. Phys.: Condens. Matter

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We study from tempered Monte Carlo simulations the magnetic phase diagram of a textured dipolar Ising model on a face centered cubic lattice. The Ising coupling of the model follow the dipoledipole interaction. The Ising axes are distributed with a uniaxial symmetry along theẑ direction with a gaussian probability density of the polar angles. This distribution provides a quenched disorder realization of the dipolar Ising model making a continuous link between the parallel axes dipoles and the random axes dipole models. As expected the phase diagram presents three distinctive phases: paramagnetic, ferromagnetic and spin-glass. A quasi long range ferromagnetic and a reentrant spin-glass phases are obtained in the vicinity of the ferromagnetic spin-glass line. This model provides a way to predict the magnetic phases of magnetic nanoparticles supracrystals in terms of the texturation of the easy axes distribution in the strong anisotropy limit. * n ∈ [0.55, 3.50] and an arithmetic distribution. * c , by using the finite size behavior of B q (L), q 2 and the probability distribution P (q) of the overlap order parameter. P (q) is characterized by two broad peaks located at

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Structural, electronic and hyperfine characterization of pure and Ta-dopedZrSiO4

Cited by 10 publications

References 42 publications

Nature of the spin-glass phase in dense packings of Ising dipoles with random anisotropy axes

Nature of the spin-glass phase in dense packings of Ising dipoles with random anisotropy axes

Phase diagram for ensembles of random close-packed Ising-like dipoles as a function of texturation

Phase diagram of a three-dimensional dipolar Ising model with textured Ising axes

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