New results about aging in an orientational glass

Alberici, F.; Doussineau, P.; Levelut, A.

doi:10.1209/epl/i1997-00356-y

Cited by 31 publications

(22 citation statements)

References 13 publications

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“…The main outcome of the experiments is the coexistence of two seemingly contradictory aspects, namely 'rejuvenation' upon cooling and 'memory' upon heating back. These experiments in spin-glasses have motivated similar experimental studies in other glassy systems including polymer glass [17], frozen ferrofluid [18], random ferromagnetic system [19], random ferroelectric system [20,21] and structural glass [22].…”

Section: Introductionmentioning

confidence: 81%

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Multiple domain growth and memory in the droplet model for spin-glasses

2001

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We study domain growth dynamics when the target state is suddenly changed on all length scales. This procedure mimics the 'chaos' effect postulated by the droplet theory of spin-glasses, and allows us to investigate in details its various dynamical consequences. We study the problem by a variety of methods, including scaling arguments, analytical solution of the spherical Mattis model, and Monte Carlo simulations of a 2-dimensional Ising Mattis model. We show that successive coarsening with respect to different equilibrium states imprints multiple domain structures on top of each other, plus extra noise due to random interferences. We demonstrate that the domain structures can be retrieved by an additional series of coarsening in the reversed order which removes the noises. We discuss the rejuvenation (chaos) and memory effects observed in temperature-cycling experiments in glassy systems from the present point of view, and discuss some open problems and alternative descriptions.

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Section: Introductionmentioning

confidence: 81%

“…Now let us consider how we can retrieve memories installed above by removing the noise that blurred stored information. Here we have to remember that memory can be retrieved by additional conjugate coarsening but only in the case a): when the noise is small enough (see (20)- (23)). …”

Section: F Multiple Coarsening In Multiple Step Cyclingmentioning

confidence: 99%

Multiple domain growth and memory in the droplet model for spin-glasses

2001

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“…Such a behaviour has been observed on spin-glasses [2,3], on disordered dielectrics such as ammonium perchlorate [4] or K 1−x Li x Ta0 3 (klt) (which is an orientational glass [5,6]), and more recently on a deeply supercooled liquid (glycerol) [7]. All these systems share common properties, but also important differences.…”

mentioning

confidence: 80%

Aging inK1−xLixTaO3
Alberici-Kious
¹
,
Bouchaud
²
,
Cugliandolo
³

et al. 1998
Phys. Rev. Lett.
74
6
72
0
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“…Thus, in a spin glass, the only influence of the cooling rate on the ageing state is due to the very last temperature interval before reaching the measurement temperature, while due to chaos effects the time spent at higher temperatures does not contribute. Again, this strongly contrasts with the case of K 1−x Li x T aO 3 alluded to above, where it is the time spent at temperatures near the glass transition that mostly determines the final state after the quench [14]. There has been quite a number of approaches, inspired by Parisi's solution of mean-field models, in which ageing can be described in terms of a random walk in the space of the metastable states [15][16][17].…”

Section: Fig 2 Same As Inmentioning

confidence: 98%

Memory and Chaos Effects in Spin Glasses

et al. 1998

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New low frequency ac susceptibility measurements on two different spin glasses show that cooling/heating the sample at a constant rate yields an essentially reversible (but rate dependent) χ(T ) curve; a downward relaxation of χ occurs during a temporary stop at constant temperature (ageing). Two main features of our results are: (i) when cooling is resumed after such a stop, χ goes back to the reversible curve (chaos) (ii) upon re-heating, χ perfectly traces the previous ageing history (memory). We discuss implications of our results for a real space (as opposed to phase space) picture of spin glasses.PACS numbers: 75.50.Lk 75.10.Nr to appear in Phys. Rev. Lett.The dynamic properties of the spin glass phase have been extensively studied by both experimentalists and theorists for almost two decades [1,2]. The observed properties reflect the out-of-equilibrium state of the system: the response to a field variation is logarithmically slow, and, in addition, depends on the time spent at low temperature ("ageing"). Ageing is fully reinitialized by heating the sample above the glass temperature T g . It corresponds to the slow evolution of the system towards equilibrium, starting at the time of the quench below T g . Many aspects of ageing are similar to the"physical ageing" phenomena that have been characterized in the mechanical properties of glassy polymers [3]. In the last few years, some interesting progress in the theoretical understanding of ageing in disordered systems has been achieved [4].From the studies of the critical behaviour at T g [5], it appears that the approach of T g is associated to the divergence of a spin-spin correlation length, as is the case in the phase transition of classical ordered systems. In the spin glass phase, the system is out of equilibrium: as in simple ferromagnets, it is tempting to associate ageing with the progressive growth of a typical domain size towards an equilibrium infinite value. However, this simple picture cannot account for all the experimental observations. In particular, the effect of small temperature cycles (within the spin-glass phase) is rather remarkable [6,7]:• on the one hand, ageing at a higher temperature barely contributes to ageing at a lower temperature. Said differently (as will be discussed again below), the thermal history at sufficiently higher temperatures is irrelevant. This is at variance with a simple scenario of thermal activation over barriers, where the time spent at higher temperature would obviously help the system to find its equilibrium state. Everything happens as if there were strong changes of the free-energy landscape with temperature. This point is suggestive of the "chaotic" aspect of the spin glass phase that has been predicted from mean field theory [8] and from scaling arguments in [9,10].• on the other hand, interesting memory effects concomitantly appear: the state reached by the system at a given temperature can be retrieved after a negative temperature cycle.In the present letter, we describe some new experiments which rev...

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New results about aging in an orientational glass

Cited by 31 publications

References 13 publications

Multiple domain growth and memory in the droplet model for spin-glasses

Multiple domain growth and memory in the droplet model for spin-glasses

Aging inK1−xLixTaO3
Alberici-Kious
¹
,
Bouchaud
²
,
Cugliandolo
³

et al. 1998
Phys. Rev. Lett.
74
6
72
0
View full text Add to dashboard Cite

Memory and Chaos Effects in Spin Glasses

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New results about aging in an orientational glass

Cited by 31 publications

References 13 publications

Multiple domain growth and memory in the droplet model for spin-glasses

Multiple domain growth and memory in the droplet model for spin-glasses

Aging inK1−xLixTaO3Alberici-Kious1, Bouchaud2, Cugliandolo3 et al. 1998Phys. Rev. Lett.746720View full textAdd to dashboardCite

Memory and Chaos Effects in Spin Glasses

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Aging inK1−xLixTaO3
Alberici-Kious
¹
,
Bouchaud
²
,
Cugliandolo
³

et al. 1998
Phys. Rev. Lett.
74
6
72
0
View full text Add to dashboard Cite