Temperature chaos in a Ge:Mn thin-film spin glass

Guchhait, Samaresh; Orbach, Raymond Lee

doi:10.1103/physrevb.92.214418

Cited by 13 publications

(12 citation statements)

References 37 publications

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“…42, "An experimental measurement of TC [temperature chaos] is still missing" (but see Ref. [3] where temperature chaos is reported for a mesoscopic GeMn amorphous spin glass). Now that the dynamical properties of spin glasses at fixed temperature are in hand, systematic exploration of temperature changes under conditions leading to temperature chaos in conventional spin glasses (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…For example, recent experiments [2,3] on Ge 89 Mn 11 , with L = 15.5 nm, have displayed dimensional crossover from D = 3 to D = 2 as a function of time and temperature. This crossover occurs because the time-dependent (t) and temperature dependent (T ) spin glass correlation length, ξ(t, T ), grows from nucleation at t = 0 to L at a time designated as t co .…”

Section: Introductionmentioning

confidence: 99%

“…We shall show this explicitly with our experimental values of T f for the different values of L we investigated (L = 4.5, 9.0, and 20 nm) for Cu 88. 3 Mn 0.117 .…”

Section: Introductionmentioning

confidence: 99%

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Glassy dynamics in CuMn thin-film multilayers

et al. 2017

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Thin film multilayered spin glass CuMn/Cu structures display glassy dynamics. The freezing temperature, T f , was measured for forty layers of CuMn films of thickness L = 4.5, 9.0, and 20.0 nm, sandwiched between non-magnetic Cu layers of thickness ≈ 60 nm. The Kenning effect, T f ∝ ℓn L, is shown to follow from power law dynamics where the correlation length grows from nucleation as ξ(t, T ) = c1a0(t/τ0) c 2 (T /Tg ) , leading to [(T f /Tg)c2ℓn(tco/τ0)] + ℓnc1 = ℓn(L/a0). Here, Tg is the bulk spin glass temperature, c1 and c2 are constants determined from the spin glass dynamics, tco is the time for the correlation length to grow to the film thickness, τ0 is a characteristic exchange time ≈ /kBTg, and a0 is the average M n − M n separation. For t ≥ tco, the magnetization dynamics are simple activated, with a single activation energy ∆max(L)/kBTg = (1/c2)[ℓn(L/a0) − ℓnc1] that does not change with time. Values for all these parameters are found for the three values of L explored in these measurements. We find experimentally ∆max(L)/kB = 907 K, 1,246 K, and 1,650 K, respectively, for the three CuMn thin film multilayer thicknesses, to be consistent with power law dynamics. We perform a similar analysis based on the activated dynamics of the droplet model, and find a much larger spread for ∆max(L) than found experimentally.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Glassy dynamics in CuMn thin-film multilayers

et al. 2017

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“…The two dimensional Ising spin glass undergoes a T = 0 phase transition, however we hope that our results would apply equally in Ising spin glasses above its lower critical dimension (which is believed to be D 2.5 [23]) in the paramagnetic phase. In fact, recent experiments on a film geometry [17,21,[24][25][26] motivated us to undertake a large scale numerical simulation of the out-equilibrium dynamics of the D = 2 spin glass [22]. These systems, for small times, will behave as if living in a spin glass phase, yet for larges times they will cross over to the dynamical critical behavior of the two dimensional Ising spin glass-a paramagnetic phase behavior.…”

Section: Introductionmentioning

confidence: 99%

Out-of-equilibrium 2D Ising spin glass: almost, but not quite, a free-field theory

Fernández¹,

Marinari²,

Martı́n-Mayor³

et al. 2018

J. Stat. Mech.

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We consider the spatial correlation function of the two-dimensional Ising spin glass under out-equilibrium conditions. We pay special attention to the scaling limit reached upon approaching zero temperature. The field-theory of a non-interacting field makes a surprisingly good job at describing the spatial shape of the correlation function of the out-equilibrium Edwards-Anderson Ising model in two dimensions. arXiv:1805.08504v2 [cond-mat.dis-nn]

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“…The system remains paramagnetic for any temperature T > 0, but the critical limit at T = 0 has puzzled theorists for many years . On the other hand, recent experiments in spin glasses are carried out in samples with a film geometry [37][38][39]. The analysis of these experiments will demand a strong theoretical command.…”

Section: Introductionmentioning

confidence: 99%

Universal critical behavior of the two-dimensional Ising spin glass

et al. 2016

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We use finite size scaling to study Ising spin glasses in two spatial dimensions. The issue of universality is addressed by comparing discrete and continuous probability distributions for the quenched random couplings. The sophisticated temperature dependency of the scaling fields is identified as the major obstacle that has impeded a complete analysis. Once temperature is relinquished in favor of the correlation length as the basic variable, we obtain a reliable estimation of the anomalous dimension and of the thermal critical exponent. Universality among binary and Gaussian couplings is confirmed to a high numerical accuracy.

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Temperature chaos in a Ge:Mn thin-film spin glass

Cited by 13 publications

References 37 publications

Glassy dynamics in CuMn thin-film multilayers

Glassy dynamics in CuMn thin-film multilayers

Out-of-equilibrium 2D Ising spin glass: almost, but not quite, a free-field theory

Universal critical behavior of the two-dimensional Ising spin glass

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