K-doped Ba122 epitaxial thin film on MgO substrate by buffer engineering

Dongyi Qin, Kazumasa Iida, Zimeng Guo +5

Molecular beam epitaxy of K-doped Ba122 (Ba${}_{1-x}$K${}_x$Fe${}_{\text{2}}$As${}_{\text{2}}$) superconductor was realized on a MgO substrate. Microstructural observation revealed that the un…