Non Ergodic Aging in Lithium-Potassium Tantalate Crystals

Abstract

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,

Aging inK1−xLixTaO3Alberici-Kious1, Bouchaud2, Cugliandolo3 et al. 1998Phys. Rev. Lett.Self Cite746720View full textAdd to dashboardCite

“…Hence, this model predicts that the excess dielectric susceptibility is linear in ln R, as indeed reported in [5]. The model also allows us to compute the subsequent evolution of ǫ. Physically, after a time t 1 + ∆t, the 'fastest' slow domains have managed to reach ξ(T 1 ), while the others slowly grow.…”

“…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.…”

“…In spin glasses, the functions f (u) and g(u) both behave similarly (as u −b [18,3]), which means that the aging part of the response obeys approximatively a simple ω · ∆t scaling (but see [3,1]). On klt crystals, g(ω) is nearly independent of frequency, at least for temperatures not too close to T 0 , while f (∆t) behaves as a power law with a small exponent [5] or a logarithm, see Fig. 1.…”

“…Several cooling histories were probed in ref. [5], with the conclusion that it is essentially the time spent around T 0 which determines the value of ǫ ′ st (ω). …”

Real-time nonequilibrium dynamics of quantum glassy systems

“…One observes a small time-difference regime, τ ≤ 5, where TTI rapidly establishes and a temperature history of the sample in the case of classical orientational glasses and classical spinglasses with short-range interactions. 3,4 This might give a warning on choosing the transverse Ising model to describe the dynamics of quantum dipolar glasses. 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 large time-difference regime, τ > 5, where the response shows a decaying queue with a t w dependence.…”