Abstract
Since the discovery of the novel iron-based superconductors, both theoretical and experimental studies have been performed intensively. Because iron-based superconductors have a smaller anisotropy than high-Tc cuprates and a high superconducting transition temperature, there have been a lot of researchers working on the film fabrication of iron-based superconductors and their application. Accordingly, many novel features have been reported in the films of iron-based superconductors, for example, the fabrication of the epitaxial film with a higher Tc than bulk samples, the extraction of the metastable phase which cannot be obtained by the conventional solid state reaction, and so on. In this paper, we review the progress of research on thin film fabrications of iron-based superconductors, especially the four categories: LnFeAs(O,F) (Ln = Lanthanide), AEFe2As2 (AE = Alkaline-earth metal), FeCh (Ch = Chalcogen), and FeSe monolayer. Furthermore, we focus on two important topics in thin films of iron-based superconductors; one is the substrate material for thin film growth on the iron-based superconductors, and the other is the whole phase diagram in FeSe1-xTex which can be obtained only by using film-fabrication technique.
Highlights
Research on iron-based superconductors is one of the most exciting topics in recent condensed matter physics
It is very surprising that the material including iron, which is a typical magnetic element that is generally considered not to be a “good friend” of a superconductivity, at the key position in the crystal shows a superconductivity with a superconducting transition temperature, Tc, above 20 K
In iron-based superconductors, the studies on the film fabrication of iron-based superconductors are mainly performed in the four systems; (1) LnFeAsO (1111-system); (2) AEFe2As2 (122-system); (3) FeCh (11-system); and (4) FeSe mono-layer film (11-system ML).We overview the progress of the researches on the film fabrication of these four kinds of materials
Summary
Research on iron-based superconductors is one of the most exciting topics in recent condensed matter physics. In the FeSe monolayer films [13] and AxFeySe2 (A = Alkaline metal) [14,15], the only electron pockets are observed in their Fermi surface These cannot be explained by the simple s± superconductivity which was proposed as a superconductivity mediated by a spin fluctuation in iron-based superconductors at early stages. We would like to compare the superconducting and structural properties in 1111, 122, and 11 films on CaF2 and to discuss the reason why the films on CaF2 show superconductivity with high Tc. The other is the whole phase diagram for iron chalcogenide superconductor, FeSe1−xTex, which can be obtained only by utilizing the film-fabrication technique. We compare the phase diagrams of FeSe1−xTex bulk samples and films, and review the reported results on FeSe1−xTex films with a whole range of x
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