Development of new routes to superconducting materials is a crucial step for the next generation of energy solutions. Besides the energy savings upon synthesis, low temperature methods significantly enhance the capabilities of fine tuning of the structure and properties of a superconducting material. A recent example is an intercalation of Li-ammonia or Li-pyridine into interlayer space of FeSe, which leads to significant increase of the superconducting transition temperature. Products of the Li-amines intercalation into pre-synthesized FeSe are fine powders with low degree of crystallinity. Temperatures of conventional solid state synthesis of FeSe (> 1000 K) are not compatible with organic amines. We have developed low temperature (450 K < T < 700 K) synthetic route to iron chalcogenides, FeQ (Q = S, Se, Te). The developed method allows us to modify crystal structure of layered FeQ chalcogenides by means of the intercalation of metal-amino complexes, e.g. Fe(ethylenediamine)22+. Unlike traditional intercalation techniques, high quality single crystals were obtained, thus facilitating determination of the crystal structure and evaluation of the properties of the synthesized compounds. Synthesis of new materials, their crystal and electronic structure as well as magnetic properties will be discussed.

Low temperature route to Fe-based chalcogenide superconductors

246th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.