Ageing phenomena in a spin-glass : effect of temperature changes below Tg

Réfrégier, Philippe; Vincent, E.; Hammann, J.; Ocio, M.

doi:10.1051/jphys:019870048090153300

Cited by 138 publications

(97 citation statements)

References 18 publications

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“…Extensive investigations of the aging properties of the magnetic response were performed in this compound: aging of TRM relaxation 21 and of the out-of-phase susceptibility 22 , effect of the temperature variations. 23 With it, the first (and probably the only) systematic measurement of the aging of the magnetic noise power spectrum in a spin glass was performed by collecting an ensemble average of noise power at 10 −2 Hz. This allowed a qualitative comparison with the results of out-of-phase susceptibility aging at the same frequency, showing that, in the quasi-stationary regime (ωt ≫ 1), FDT was approximately valid.…”

Section: Principle Of Measurement: An Absolute Thermometermentioning

confidence: 99%

Experimental investigation of the fluctuation dissipation relation in a spin glass

Hérisson

Ocio

2003

SPIE Proceedings

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We present the first experimental determination of the time auto-correlation of magnetization in the nonstationary regime of a spin glass, and its quantitative comparison with the corresponding response, the magnetic relaxation function. These measurements were performed in a new experimental setup working as an absolute thermometer. Clearly, we observe a non-linear fluctuation-dissipation relation between correlation and relaxation, i.e. an effective temperature higher than the bath temperature in the aging regime. According to theoretical developments on mean field models, and lately on short range ones, in the limit of very large waiting times, the relation between relaxation and correlation in the aging regime becomes temperature independent for a given system. A scaling procedure allows us to extrapolate to the limit of long waiting times by separating stationary and non-stationary regimes and to check the validity of the temperature independence of the fluctuation dissipation relation in the non-stationary regime.

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Section: Principle Of Measurement: An Absolute Thermometermentioning

confidence: 99%

Experimental investigation of the fluctuation dissipation relation in a spin glass

Hérisson

Ocio

2003

SPIE Proceedings

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“…We turn now to another set of experiments 9 , where larger shifts 8 T 1 → T 2 , and possibly cycles T 1 → T 2 → T 1 , are performed. In the previous section, indeed, the dynamics after a shift was the continuation of the aging before the shift.…”

Section: Large Temperature Shifts: Rejuvenation Kovacs and Memormentioning

confidence: 99%

“…These two forms (additive and multiplicative) are actually not very different for short times, since C aging (t, t w ) is approximately constant for t ≪ t w , in the regime where C eq (t) varies most. However, one should stress that the extrapolation of the multiplicative scaling behavior (8) associated to (9) to large times implies a zero Edwards-Anderson parameter, defined dynamically as:…”

Section: Isothermal Aging: Basic Factsmentioning

confidence: 99%

“…The low-temperature dynamics of various spin glass systems has been thoroughly investigated 3,4 , and a number of characteristic features have emerged. Among these are the well-known aging behaviour of the thermoremanent magnetisation or the a.c. susceptibility in isothermal experiments 5 , and the spectacular 'memory' and 'rejuvenation' effects observed in temperature-shifts protocols [6][7][8][9] . It is fair to say that none of the existing theories provides a complete quantitative description of spin glass dynamics 10 .…”

Section: Introductionmentioning

confidence: 99%

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Geometrical aspects of aging and rejuvenation in the Ising spin glass: A numerical study

2002

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We present a comprehensive study of non-equilibrium phenomena in the low temperature phase of the Edwards-Anderson Gaussian spin glass in 3 and 4 spatial dimensions. Many effects can be understood in terms of a time dependent coherence length, ℓT , such that length scales smaller that ℓT are equilibrated, whereas larger length scales are essentially frozen. The time and temperature dependence of ℓT is found to be compatible with critical power-law dynamical scaling for small times/high temperatures, crossing over to an activated logarithmic growth for longer times/lower temperatures, in agreement with recent experimental results. The activated regime is governed by a 'barrier exponent' ψ which we estimate to be ψ ∼ 1.0 and ψ ∼ 2.3 in 3 and 4 dimensions, respectively. We observe for the first time the rejuvenation and memory effects in the four dimensional sample, which, we argue, is unrelated to 'temperature chaos'. Our discussion in terms of length scales allows us to address several experimentally relevant issues, such as super-aging versus sub-aging effects, the role of a finite cooling rate, or the so-called Kovacs effect.

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“…The protocols that have been more commonly used include temperature and field cycling within the low temperature phase [21]. Different types of glasses show rather different responses to the change in external parameters.…”

Section: Temperature Cycling Protocolsmentioning

confidence: 99%