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

W. Kleemann; A. Albertini; R. V. Chamberlin; J. G. Bednorz

doi:10.1209/epl/i1997-00124-7

All issues

Volume 37 / No 2 (January II 1997)

Europhys. Lett., 37 2 (1997) 145-150

Abstract

Issue		Europhys. Lett. Volume 37, Number 2, January II 1997


Page(s)		145 - 150
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1997-00124-7
Published online		01 September 2002

Europhys. Lett., 37 (2), pp. 145-150 (1997)

Relaxational dynamics of polar nanodomains in Sr_1-xCa_xTiO₃ x = 0.002

W. Kleemann¹, A. Albertini¹, R. V. Chamberlin² and J. G. Bednorz³

¹ Laboratorium für Angewandte Physik, Gerhard-Mercator-Universität Duisburg, D-47048 Duisburg, Germany
² Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504, USA
³ IBM Forschungslaboratorium - Säumerstrasse 4, CH-8803 Rüschlikon, Switzerland

Received: 25 June 1996
Accepted: 22 November 1996

Abstract

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).

PACS: 77.22.Gm – Dielectric loss and relaxation / 78.30.Ly – Disordered solids

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