Glasslike Dynamics of Polar Domain Walls in Cryogenic SrTiO3

Pesquera, David and Carpenter, Michael A. and Salje, Ekhard K. H. (2018) Glasslike Dynamics of Polar Domain Walls in Cryogenic SrTiO3. Physical Review Letters, 121 (23). ISSN 0031-9007 DOI https://doi.org/10.1103/PhysRevLett.121.235701

[img] Text
PhysRevLett.121.235701.pdf - Published Version

Download (955kB)
Official URL: https://doi.org/10.1103/PhysRevLett.121.235701

Abstract

Polar and highly mobile domain walls in SrTiO3 move under electric and elastic fields. Two vastly different timescales dominate their dynamical behavior. The previously observed fast changes lead to anomalies near 40 K where the elastic moduli soften and the polarity of the walls becomes strong. Keeping the sample under isothermal conditions leads to a new and unexpected phenomenon: The softening vanishes over timescales of days while the piezoelectricity of the sample remains unchanged. The hardening follows glass dynamics below an onset at T∗≈40  K. The timescale of the hardening is strongly temperature dependent and can be followed experimentally down to 34 K when the relaxation is not completed within two days. The relaxation time of a stretched exponential decay increases exponentially with the decreasing temperature. This relaxation process follows similar dynamics after zero-field cooling and after applying or removing an electric field. The sluggish behavior is attributed to collective interactions of domain patterns following overdamped glass dynamics rather than ballistic dynamics.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
08 - Green Open Access
Journal or Publication Title: Physical Review Letters
Volume: 121
Identification Number: https://doi.org/10.1103/PhysRevLett.121.235701
Depositing User: Sarah Humbert
Date Deposited: 11 Apr 2019 15:56
Last Modified: 11 Apr 2019 15:56
URI: http://eprints.esc.cam.ac.uk/id/eprint/4463

Actions (login required)

View Item View Item

About cookies