X-ray absorption study of the local dipole moment in SrTiO3 under uniaxial pressure

• Published in: Journal of the Korean Physical Society Vol. 66; no. 9; pp. 1386 - 1388
• Main Authors: Temba, Chisato, Kawakami, Shuhei, Nakajima, Nobuo, Ishimatsu, Naoki, Maruyama, Hiroshi
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.05.2015; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Strontium titanate; Uniaxial pressure; Phase transition
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.66.1386

X-ray absorption spectra under uniaxial pressure were measured at the Ti K -edge of a SrTiO 3 single crystal in order to obtain direct evidence for the ferroelectric transition that is expected on the basis of second harmonic generation studies. A uniaxial pressure was applied perpendicular to the ab -plane. The pre-edge peak, which corresponds to Ti 3 d e g -O 2 pσ bonding, shows little change across the transition temperature of 40 K at 1 GPa. This indicates that a local electric dipole moment is not induced under uniaxial pressure, as opposed to the macroscopic ferroelectric moments that are predicted to be induced along the ab -plane.