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Anomalous dielectric and optical properties in perovskite-type artificial superlattices

机译：钙钛矿型人造超晶格的异常介电和光学性质

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摘要

Perovskite-type BaTiO_3/SrTiO_3 (BTO/STO) artificial superlattices were fabricated by molecular beam epitaxy process and their dielectric properties and refractive indices were measured. A large leakage current was observed in the films on Nb-doped STO substrate. Dielectric permittivity was therefore measured using planer interdigital electrodes. Fine planer electrodes were necessary to reduce the penetration of electric flux into the substrate. Interdigital electrodes were formed by electron-beam lithography. Dielectric permittivity of superlattices along the film surface was determined using electromagnetic field analysis. It was found that the dielectric permittivity of the BTO/STO superlattice with the period of 10 unit cells showed a maximum value above 30,000, which was almost independent from frequency up to 110 MHz. The refractive index of superlattices measured with a spectroscopic ellipsometer also showed the highest value when the period was 10 unit cells. This indicated that the structure of superlattices affected not only the ionic polarization but also the electric polarization. The origin of anomalous properties observed in superlattices may be interpreted by the strains induced into the film.
机译：通过分子束外延法制备了钙钛矿型BaTiO_3 / SrTiO_3（BTO / STO）人造超晶格，并测量了其介电性能和折射率。在掺Nb的STO衬底上的薄膜中观察到大的漏电流。因此，使用平面叉指电极测量介电常数。精细的平面电极对于减少电通量渗透到基板中是必不可少的。叉指电极通过电子束光刻形成。使用电磁场分析确定沿膜表面的超晶格介电常数。结果发现，BTO / STO超晶格在10个晶胞周期内的介电常数显示出最大值30,000以上，这几乎与高达110 MHz的频率无关。当周期为10个晶胞时，用分光镜椭圆仪测量的超晶格的折射率也显示出最高值。这表明超晶格的结构不仅影响离子极化，而且影响电极化。在超晶格中观察到的异常性质的起因可以解释为薄膜中产生的应变。

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