Relaxational dynamics of polar nanodomains in Sr1 − xCaxTiO3 x = 0.002

The dielectric permittivity of ${\rm Sr}_{1-x}{\rm Ca}_x{\rm TiO}_3$, x = 0.002, measured at frequencies $10^{-3} \le f \le 10^7\;{\rm Hz}$ and temperatures $1.5 \le T \le 15\;{\rm K}$, exhibits enhanced loss, $\varepsilon''(f)$, on its low-f slope. This contrasts with conventional glassy...

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Bibliographic Details
Published in:Europhysics letters 1997-01, Vol.37 (2), p.145-150
Main Authors: Kleemann, W, Albertini, A, Chamberlin, R. V, Bednorz, J. G
Format: Article
Language:English
Subjects:
77.22.Gm
78.30.Ly
Online Access:Get full text
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Summary:The dielectric permittivity of ${\rm Sr}_{1-x}{\rm Ca}_x{\rm TiO}_3$, x = 0.002, measured at frequencies $10^{-3} \le f \le 10^7\;{\rm Hz}$ and temperatures $1.5 \le T \le 15\;{\rm K}$, exhibits enhanced loss, $\varepsilon''(f)$, on its low-f slope. This contrasts with conventional glassy dynamics and is attributed to dynamic heterogeneity involving thermally activated relaxation of dynamically coupled mesoscopic domains. Crossover into non-activated dynamics occurs at very low f as corroborated by temporal relaxation studies of the field-induced polarization P. Below $T \approx 3\;{\rm K}$ athermal quantum tunneling starts to dominate both $\varepsilon''(f)$ and P(t).
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i1997-00124-7