论文标题
超薄BA掺杂的SRRRUO3膜中的厚度依赖性巡回磁力
Thickness Dependent Itinerant Ferromagnetism in Ultrathin Ba-Doped SrRuO3 films
论文作者
论文摘要
ABO3钙钛矿氧化物中的电子和磁性对晶格结构极为敏感，但尺寸也是薄膜形式的厚度。在这里，我们报告了SRTIO3（001）底物上超薄稳定的SR1-XBAXRUO3（X = 0.08，0.2）薄膜的厚度依赖性的电磁特性。结果表明，BA掺杂（0.08 <x <0.20）降低了SRRUO3中存在的RUO6原骨畸变，并诱导了四方畸变，如平面外晶格扩张所证明的那样。金属到绝缘体的过渡，并伴有铁磁至非磁性过渡，无论掺杂水平如何，X = 0.08和0.2的膜厚度从10 = 3 = 0.08和0.2减少。结果表明，通过尺寸限制引入的组成空缺以及表面/界面贡献的影响比A位置化学障碍或结构性失真更为主导，对于超薄外延膜中金属性和铁磁性的丧失。
The electronic and magnetic properties in ABO3 perovskite oxides are extremely sensitive to lattice structure but also the dimensionality, such as the thickness in thin film form. Here, we report the thickness-dependent electro-magnetic properties of ultrathin epitaxially stabilized Sr1-xBaxRuO3 (x = 0.08, 0.2) thin films on SrTiO3 (001) substrate. The results reveal that the Ba-doping (0.08 < x < 0.20) reduces RuO6 orthorhombic distortions existing in SrRuO3 and induces a tetragonal distortion as evidenced by out-of-plane lattice expansion. A metal-to-insulator transition, accompanied by a ferromagnetic to non-magnetic transition occurs with reducing film thickness from 10 to 3 unit-cell (u.c.) for both x = 0.08 and 0.2, regardless of the doping level. The results suggest that the effects of compositional vacancies and surface/interface contributions introduced via dimensional confinement are more dominant than A-site chemical disorder or structural distortion for the loss of metallicity and ferromagnetism in ultra-thin epitaxial films.
