Ultrafast transient increase of oxygen octahedral rotations in a perovskite

Abstract

The ability to control the structure of a crystalline solid on ultrafast timescales bears enormous potential for information storage and manipulation or generating new functional states of matter [1]. In many materials where the ultrafast control of crystalline structures has been explored, optical excitation pushes materials towards their less ordered high temperature phase [2{9] as electronically driven ordered phases melt and possible concomitant structural modifications relax. Nonetheless, for a few select materials it has been shown that photoexcitation can slightly enhance the amplitude of an electronic ordering phenomenon (i.e. its electronic order parameter) [9{13]. Here we show via femtosecond hard X-ray diffraction that photodoping of the perovskite EuTiO3 transiently increases the order parameter associated with a purely structural [14] phase transition represented by the antiferrodistortive rotation of the oxygen octahedra. This can be understood from an ultrafast charge-transfer induced reduction of the Goldschmidt tolerance factor [15], which is a fundamental control parameter for the properties of perovskites

arXiv comment11 pages, 3 figures

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Cited by in corpus (6)

• Topological phonons in oxide perovskites controlled by light
• Free carrier induced ferroelectricity in layered perovskites
• Large photo-induced tuning of ferroelectricity in sliding ferroelectrics
• Structurally assisted melting of excitonic correlations in 1T-TiSe2
• Topological polarons in halide perovskites
• Ultrafast Suppression of the Ferroelectric Instability in KTaO${}_3$