Ferroelectricity Induced by Oxygen Isotope Exchange in Strontium Titanate Perovskite

M. Itoh; R. Wang; Y. Inaguma; T. Yamaguchi; Y-J. Shan; T. Nakamura

doi:10.1103/PhysRevLett.82.3540

Ferroelectricity Induced by Oxygen Isotope Exchange in Strontium Titanate Perovskite

M. Itoh, R. Wang, Y. Inaguma, T. Yamaguchi, Y-J. Shan, and T. Nakamura

Phys. Rev. Lett. 82, 3540 – Published 26 April 1999

Abstract

Ferroelectricity was induced in $SrTiO_{3}$ by the isotope exchange of $^{18} O$ for $^{16} O$ . Dielectric measurements confirmed the ferroelectricity of $SrTi^{18} O_{3}$ , showing a peak at 23 K. A hysteresis loop in the $D$ vs $E$ measurement and TO phonon observed in the Raman spectra supported the evolution of ferroelectricity in $SrTi^{18} O_{3}$ . This is the first demonstration of $SrTi O_{3}$ becoming ferroelectric without the application of external fields or the introduction of a random field through cation substitution.

Received 28 December 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.3540

Authors & Affiliations

M. Itoh^1,*, R. Wang¹, Y. Inaguma¹, T. Yamaguchi², Y-J. Shan³, and T. Nakamura³

¹Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori, Yokohama 226-8503, Japan
²Department of Electrical Engineering, Faculty of Science and Engineering, Meisei University, Hodokubo, Hino, Tokyo 191-8506, Japan
³Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya 321-8585, Japan