Biaxially textured FeSe1-xTex films have been realized on Fe-buffered MgO substrates by pulsed laser deposition. Similar to the Fe/BaFe2As2 bilayers, the crystalline quality of FeSe1-xTex films exhibit a sharp out-of-plane and in-plane texture less than 0.9°. The Fe/FeSe1-xTex bilayers showed high superconducting transition temperatures of over 17 K. The angular-dependent critical current densities exhibit peaks positioned at H // ab similar to other pnictide thin films. The volume pinning force of FeSe1-xTex in this direction is very strong compared with that of Co-doped BaFe2As2, due to a good matching between the interlayer distance in the c direction and the out-of-plane coherence length.
K-doped Ba122 epitaxial thin film on MgO substrate by buffer engineering
在MgO衬底上实现了K掺杂Ba 122（Ba $_{1-x}$ K $_x$ Fe $_\text{2}$ As $_\text{2}$）超导体的分子束外延。显微结构观察表明，未掺杂的Ba 122作为一个完美的缓冲层的K掺杂Ba 122的外延生长。该薄膜在4K时具有39.8 K的高临界温度和3.9 MA/cm $^\text{2}$的高临界电流密度。外延薄膜的成功生长将使在氧化物双晶衬底上实现人工单晶界成为可能，并揭示了K掺杂Ba 122的晶界输运性质。
Freestanding GdBa2Cu3O7 Thin Films via Optimized Buffer Layer Design: Preserving Superconducting Properties
College of Industrial Technology, Nihon University（日本大学产业技术学部）；Institute for Technical Physics, Karlsruhe Institute of Technology（卡尔斯鲁厄理工学院技术物理研究所）；Department of Materials Physics, Nagoya University（名古屋大学物质物理学系）；The Ultramicroscopy Research Center, Kyushu University（九州大学超显微研究中心）；Department of Advanced Materials Science and Engineering, Kyushu University（九州大学先进材料科学与工程系）；Interdisciplinary Graduate School of Engineering Sciences, Kyushu University（九州大学工学研究科交叉研究生院）
Strain induced superconductivity in the parent compound BaFe2As2
在SrTiO_3衬底上生长的单层FeSe（体相Tc =8K）薄膜中发现了转变温度高达65K的超导电性（SC），引起了人们对铁基薄膜的特别关注。高Tc是从氧空位衬底到FeSe薄膜的电子转移和晶格拉伸应变的组合效应的结果。在这里，我们证明了SC的实现在母体化合物BaFe2As2（没有散装Tc）只是通过拉伸晶格应变没有电荷掺杂。研究了在Fe缓冲MgAl 2 O 4单晶衬底上外延BaFe 2 As 2薄膜中应变与SC之间的相互作用。Fe和FeAs亚晶格之间的强界面键合增加了由于晶格失配导致的反铁磁自旋密度波的抑制，并诱导SC与体Tc？一万这些结果突出了结构变化在控制铁基超导体相图中的作用。
