Can Aging Phenomena Discriminate Between the Droplet Model and a Hierarchical Description in Spin Glasses?

Lefloch, F.; Hammann, J.; Ocio, M.; Vincent, E.

doi:10.1209/0295-5075/18/7/013

Cited by 201 publications

(196 citation statements)

References 16 publications

(10 reference statements)

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“…The time spent at the intermediate temperature T2 < Ti, even if time evolution is observed during that period, has no influence on the relaxation at TI. These results are reminiscent of those observed in spin-glasses [16]. Aging effects have been observed in these materials but they do not show ergodicity breaking in the sense we have given here.…”

Section: Ergodicity Breakingsupporting

confidence: 87%

Non Ergodic Aging in an Orientational Glass

1996

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: In K1-xLi,Ta03, small Li+ ions are randomly substituted to large K+ ions. They take off-centre positions creating therefore electric dipoles and elastic quadnrpoles at random sites. This disordered system presents frozen random interactions and frustration. For x > 2.5 %. thermal hysteresis signals a structural transition with a first order character towards a ferroelectric low temperature phase. For x c 2.5 %, at low temperatures the system is frozen in a disordered phase called orientational glass. Measurements of the dielectric constant E and of the elastic constant c provide a lot of information about the nature of the transition and the relaxation of the Li+ ions which has been studied in detaik and analyzed in the form of Argand diagrams exhibiting a very particular (strophoidal) shape. After zero field cooling from 100 K to 4.2 K the time evolution of E and c during 80,000 s has been followed. The behaviour of the system (amplitude and asymptot) strongly depends on the cooling rate. The fact that the asymptotic limit depends on the initial conditions shows that ergodicity is broken in this system.

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Section: Ergodicity Breakingsupporting

confidence: 87%

Non Ergodic Aging in an Orientational Glass

1996

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“…17,[37][38][39][40] Both models are quite successful in describing the memory effect in spin-glass systems. 27 We will not reiterate them here.…”

Section: Figmentioning

confidence: 99%

Memory effect and spin-glass-like behavior in Co-Ag granular films

Zhang

Zheng

et al. 2007

Phys. Rev. B

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The memory effect was clearly observed in dc-sputtered metallic, magnetic Co-Ag granular films, which indicates the existence of a spin-glass-like phase at low temperatures. However, the memory effect diminished dramatically after the films were annealed at 300°C for 1 h. It was also found that the memory effect weakened gradually with increasing volume fraction of magnetic clusters. The experimental results indicate that the dipolar interaction is not the major origin for the formation of low-temperature spin-glass-like ͑SGL͒ phase in metallic, magnetic granular materials. On the other hand, a Ruderman-Kittel-Kasuya-Yosida-like exchange interaction between the nanoparticles may be responsible for the collective SGL dynamics and the resulting memory effect.

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“…[5,6] From the experimental side, a series of interesting experiments have been done with different spin-glasses measuring relaxations of thermo-remanent magnetization (TRM), zero-field cool magnetization (ZFC) and AC-magnetic susceptibilities. They show strikingly rich dynamical aspects of spin-glasses subjected to small temperature cycles (within the spin-glass phase) [7][8][9][10][11][12][13][14][15][16]. The main outcome of the experiments is the coexistence of two seemingly contradictory aspects, namely 'rejuvenation' upon cooling and 'memory' upon heating back.…”

Section: Introductionmentioning

confidence: 99%

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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Can Aging Phenomena Discriminate Between the Droplet Model and a Hierarchical Description in Spin Glasses?

Cited by 201 publications

References 16 publications

Non Ergodic Aging in an Orientational Glass

Non Ergodic Aging in an Orientational Glass

Memory effect and spin-glass-like behavior in Co-Ag granular films

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

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