Ultrafast transient increase of oxygen octahedral rotations in a perovskite
| Autor: | Porer, M., Fechner, M., Kubli, M., Neugebauer, M. J., Parchenko, S., Esposito, V., Narayan, A., Spaldin, N. A., Huber, R., Radovic, M., Bothschafter, E. M., Glownia, J. M., Sato, T., Song, S., Johnson, S. L., Staub, U. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Research 1, 012005 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.1.012005 |
| Popis: | 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 Comment: 11 pages, 3 figures |
| Databáze: | arXiv |
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