Anomalous dielectric relaxation in lithium-potassium tantalate crystals

Doussineau, P.; Farssi, Y.; Frénois, Ch.; Levelut, A.; Toulouse, J.; Ziółkiewicz, S.

doi:10.1051/jp1:1994250

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…The lithium concentration z of a sample is deduced either according to the empirical law proposed by van der Klink e~al. Tt(K) = 535x~/~r elating x to the transition temperature Tt [6] determined by dielectric or acoustic experiments, or according to another empirical law relating x to the anharmonic elastic properties [7]. Some concentrations were checked by…”

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confidence: 99%

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Non Ergodic Aging in Lithium-Potassium Tantalate Crystals

1997

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Isothermal kinetics of the orientational l'ergodicit4, Ceci montre que l'espace des phases est repr4sentable par un paysage compliqu4 oh des val14es mutuellement inaccessibles sont s4par4es par de trAs hautes barriAres. Des exp4riences de cycles en temp4rature en apportent une vision plus d4tail14e : elles s'expliquent en effet dons le cadre d'une organisation h14rarchique d4pendaut de la temp4rature. 1. constraints are easily taken into account by means of the relevant thermodynamic potential,

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Section: If the Differentmentioning

confidence: 99%

“…Secondary Ion ~Iass Spectroscopy (SIMS). Since most of the same samples were already used, we keep the labelling (in roman numbers) adopted in previous publications [5,7]. (iii) Temperature Cycles.…”

Section: If the Differentmentioning

confidence: 99%

Non Ergodic Aging in Lithium-Potassium Tantalate Crystals

1997

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“…Experimental data. -Here again, we keep the same labelling mode for our KLT samples as already used in our previous papers [7]. The two samples used in the present study were grown in our laboratory from a top-seeded solution.…”

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Kinetics effects in lithium-potassium tantalate crystals

Doussineau¹,

Levelut²,

Ziółkiewicz³

1996

Europhys. Lett.

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The study of the dielectric and acoustic constants, performed in a K0.99Li0.01TaO3 crystal between 4 and 30 K, puts in evidence a strong analogy between the kinetics of these two susceptibilities. In particular, the two characteristic times measured for each of them have near values and they are roughly constant in all the temperature range. An explanation in terms of tetragonal domains, with quadrupolar order and dipolar disorder, is suggested.( * ) Associated with the Centre National de la Recherche Scientifique.

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“…*Note that the persistence of a power-law distribution of relaxation times above the glass temperature and thus with x > 1 has also been reported in dipolar glasses (see [16])…”

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confidence: 77%

Aging and Glassy Dynamics in Complex Systems: Some Theoretical Ideas

Bouchaud

1994

MRS Proc.

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We discuss some recent experimental results on the non-stationary dynamics of spinglasses, which serves as an excellent laboratory for other complex systems. Inspired from Parisi's mean-field solution, we propose that the dynamics of these systems can be though of as a random walk in phase space, between traps characterized by trapping time distribution decaying as a power law. The average exploration time diverges in the spin-glass phase, naturally leading to time-dependent dynamics with a charateristic time scale fixed by the observation time t,. itself (aging). By the same token, we find that the correlation function (or the magnetization) decays as a stretched exponential at small times t < t. crossing over to power-law decay at large times t »> t,. Finally, we discuss recent speculations on the relevance of these concepts to real glasses, where quenched disorder is a priori absent.One of the most striking features of glassy dynamics is the aging phenomenon [1,2], that is, the fact that most physical properties strongly depend on the history of the sample, in particular the time t,,, elapsed since the quench from high temperature into the glass phase. For example, the a.c. susceptibility of a spin-glass at a frequency w decays towards its equilibrium value as (wt,)j-1, where x is an exponent less than 1. In fact, the full the response function R(t, t') does not depend on the difference t -t', as in usual equilibrium dynamics, but rather on the ratio 1. Since the equilibration time is infinite, the only relevant time scale can only be the experimental time itself. In this sense, time translation 347 Mat.

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Anomalous dielectric relaxation in lithium-potassium tantalate crystals

Cited by 7 publications

References 12 publications

Non Ergodic Aging in Lithium-Potassium Tantalate Crystals

Non Ergodic Aging in Lithium-Potassium Tantalate Crystals

Kinetics effects in lithium-potassium tantalate crystals

Aging and Glassy Dynamics in Complex Systems: Some Theoretical Ideas

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