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000062959 084__ $$2WoS$$aPhysics, Applied
000062959 1001_ $$0P:(DE-HGF)0$$aKuzel, P.$$b0
000062959 245__ $$aField-induced soft mode hardening in SrTi03/DySc03 multilayers
000062959 260__ $$aMelville, NY$$bAmerican Institute of Physics$$c2008
000062959 300__ $$a052910-1 - 052910-3
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000062959 440_0 $$0562$$aApplied Physics Letters$$v93$$x0003-6951
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000062959 520__ $$aWe investigate a SrTiO3/DyScO3 epitaxial multilayer with four 50-nm-thick layers of each compound deposited on DyScO3 substrate by pulsed laser deposition. The spectra of SrTiO3 obtained using time-domain terahertz spectroscopy at room temperature with and without electrical bias are explained by the ferroelectric soft mode coupled to a silent central peak, where the bare soft mode frequency is the only field-dependent parameter. We show that terahertz and subterahertz properties of the layers are determined solely by a tremendous hardening of the soft mode with increasing field. We demonstrate that our structure induces more than 40% modulation of the transmitted terahertz power in a broad frequency range of 0.65-1.15 THz at 140 V (93 kV/cm) bias.
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000062959 7001_ $$0P:(DE-Juel1)128631$$aSchubert, J.$$b3$$uFZJ
000062959 7001_ $$0P:(DE-Juel1)128715$$aPanaitov, G.$$b4$$uFZJ
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