Soft mode behavior in SrTiO3/DyScO3 thin films: Evidence of ferroelectric and antiferrodistortive phase transitions

[摘要]：Infrared reflectance, terahertz transmittance, and microwave resonance measurements show that SrTiO3 films, strained by similar to 1% in biaxial tension by growing them on (110) DyScO3 substrates, undergo a pronounced phonon softening near 270 K. This in-

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