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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.18: Poster

Montag, 22. März 2010, 14:00–18:00, Poster A

Thin Film Deposition of the Pnictide Superconductors LaO_1−xNiBi and LaO_1−xCuBi using Reactive Molecular Beam Epitaxy — •Alexander Buckow, Jose Kurian, and Lambert Alff — Institut für Materialwissenschaft, TU Darmstadt, Germany

The discovery of iron-based superconductors with T_C above 50 K [1,2] has renewed the interest in the area of high-temperature superconductors. To establish the mechanism of superconductivity in this new group of superconductors, one needs high quality single crystalline and/or epitaxial thin film samples. Most attempts to grow epitaxial thin films of iron-based superconductors were by Pulsed Laser Deposition (PLD) with limited success.

Reactive Molecular Beam Epitaxy (RMBE) is not only a powerful and flexible tool for the synthesis of thin films, but also an ideal technique for the study of composition dependent properties or in the search for new compounds. Since arsenic is toxic we have grown films of the similar compounds LaO_1−xNiBi and LaO_1−xCuBi [3] from elemental sources on (100) MgO substrates by RMBE. Thin films were characterized by XRD, ρ – T and ICP-OES. The superconducting transition temperature of LaO_1−xNiBi thin film is about 6 K compared to 4.4 K as reported for bulk.

[1] Kamihara et al., J. Am. Chem. Soc. 130, 3296 (2008).

[2] Wang et al., EPL 83, 67006 (2008).

[3] Kozhevnikov et al., JETP Lett. 87, 649 (2008).