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Anomalous growth and properties of SrTiO_3-NaNbO_3 superlattices

机译:SrTiO_3-NaNbO_3超晶格的异常生长和性质

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摘要

Epitaxial multilayers and superlattices of quantum paraelectric perovskite SrTiO_3 and NaNbO_3 constituents with excellent lattice match are grown by pulsed laser deposition on MgO and LaAlO_3 substrates using an La_(0.5_)Sr_(0.5)CoO_3 bottom electrode. Pseudomorphic growth of superlattices is demonstrated for the period as large as 40 nm. With decreasing period below~20 nm, increase in unit-cell volume exceeding those of bulk constituents and their solid solutions is found. Superlattices exhibit both out-of-plane (normal to substrate surface) and in-plane (parallel to substrate surface) insulating behavior, and decrease in the out-of-plane dielectric permittivity with decreasing period. The results are discussed in terms of possible lattice distortion at the SrTiO_3: NaNbO_3 interface due to ionic charge mismatch between constituents. Presence of high-permittivity interfacial layers is suggested to be responsible for the evolution of permittivity with decreasing superlattice period.
机译:利用La_(0.5_)Sr_(0.5)CoO_3底部电极通过脉冲激光沉积在MgO和LaAlO_3衬底上,生长出具有优良晶格匹配的量子顺电钙钛矿SrTiO_3和NaNbO_3成分的外延多层和超晶格。超晶格的拟晶生长在长达40 nm的时间内得到了证明。随着约20nm以下的减小周期,发现单位晶格体积的增加超过了本体成分及其固溶体的体积。超晶格同时表现出平面外(垂直于基板表面)和平面内(平行于基板表面)的绝缘行为,并且平面外介电常数随周期减小而降低。讨论了由于组分之间的离子电荷失配而导致SrTiO_3:NaNbO_3界面可能发生晶格畸变的结果。高介电常数界面层的存在被认为是随着超晶格周期的减少介电常数的演变。

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