Field-induced soft mode hardening in SrTi03/DySc03 multilayers

Kuzel, P.; Panaitov, G.; Schubert, J.; Kadlec, C.; Kadlec, F.

doi:10.1063/1.2967336

Journal Article

Field-induced soft mode hardening in SrTi03/DySc03 multilayers

Kuzel, P. ; Kadlec, C. ; Kadlec, F. ; Schubert, J.FZJ* ; Panaitov, G.FZJ*

2008
American Institute of Physics Melville, NY

Applied physics letters 93, 052910-1 - 052910-3 (2008) [10.1063/1.2967336]

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Please use a persistent id in citations: http://hdl.handle.net/2128/17366 doi:10.1063/1.2967336

Abstract: We investigate a SrTiO3/DyScO3 epitaxial multilayer with four 50-nm-thick layers of each compound deposited on DyScO3 substrate by pulsed laser deposition. The spectra of SrTiO3 obtained using time-domain terahertz spectroscopy at room temperature with and without electrical bias are explained by the ferroelectric soft mode coupled to a silent central peak, where the bare soft mode frequency is the only field-dependent parameter. We show that terahertz and subterahertz properties of the layers are determined solely by a tremendous hardening of the soft mode with increasing field. We demonstrate that our structure induces more than 40% modulation of the transmitted terahertz power in a broad frequency range of 0.65-1.15 THz at 140 V (93 kV/cm) bias.

Keyword(s): J

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