Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.10: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Analysis of Electronic Properties from Magnetotransport Measurements on Ba(Fe_1−xNi_x)₂As₂ Thin Films — •Ilia Shipulin¹, Aleena Anna Thomas^1,2, Stefan Richter^1,2, Kornelius Nielsch^1,2, and Ruben Hühne¹ — ¹Leibniz IFW Dresden, Institute for Metallic Materials, Dresden, Germany — ²2 School of Sciences, TU Dresden, Dresden, Germany

Within the last years, significant progress was made in the field of single crystal growth of 122 based materials with isovalent, hole or electron doping, which made it possible to study the thermodynamic and transport properties of these compounds. At the same time, the preparation of high-quality epitaxial thin films of 122 materials resulted at least for the BaFe₂As2₂ based compounds in properties comparable to single crystals. Such films are of particular interest for the study of both fundamental and applied questions. Therefore, we focused our research on the two tasks: growing epitaxial thin films of Ba(Fe_1−xNi_x)₂As₂ with different nickel concentrations by PLD method and studying the main electronic characteristics of the obtained Ba(Fe1-xNix)2As2 thin films. Based on the results of magnetotransport studies we estimated the density of electronic states at the Fermi level, the coefficient of electronic heat capacity and other electronic parameters of this compound and their dependence on the dopant concentration within the framework of the Ginzburg-Landau-Abrikosov-Gorkov theory. The comparison of the determined parameters with the measurement data of similar Ba(Fe_1−xNi_x)₂As₂single crystals demonstrates a good agreement, which confirms the high quality of the obtained films.