Isotropic shrinkage of the oxygen octahedron in SrTiO3 under uniaxial pressure. (23rd August 2017)

• Record Type: Journal Article
• Authors: Lu, Cong; Temba, Chisato; Nakajima, Nobuo; Kawakami, Shuhei; Ishimatsu, Naoki; Maruyama, Hiroshi
• Is Part Of: Journal of physics. Volume 29:Number 39(2017)
• Publication Date: 2017-08-23
• Subjects: uniaxial pressure -- strontium titanate -- x-ray absorption spectroscopy; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aa7ec6
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: X-ray absorption spectra at the Ti K -edge of a SrTiO3 single crystal under uniaxial pressure were measured to obtain evidence of uniaxial pressure-induced polarization predicted in SrTiO3 from the electronic viewpoint. The pre-edge 3 d - e g peak decreases in intensity with increasing uniaxial pressure, together with an energy shift to higher energy side. Contrary to uniaxial deformation, these changes were independent of incident x-ray polarization. This implies the presence of a mechanism that maintains the isotropic coordination environment around a Ti atom, i.e. a tilt and rotation of the TiO6 octahedron accompanied by its isotropic shrinkage, hence the local polarization essential to the ferroelectric order cannot be observed.