Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.7: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Deposition of CeCoIn₅ thin films by co-sputtering and evaporation — •Jochen Geerk¹, Alexander Zaitsev¹, Rainer Fromknecht¹, Andre Beck¹, and Hilbert v. Löhneysen^1,2 — ¹Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P.O.B. 3640, D-76021 Karlsruhe, Germany — ²Physikalisches Institut, Universität Karlsruhe

Thin films of the heavy fermion superconductor CeCoIn₅ were prepared on sapphire substrates with different orientations by combining sputtering (Ce and Co) and evaporation (In). The sputter targets of Ce and Co were arranged in a face-to-face geometry with a magnetic field applied perpendicular to the target surface thus providing an oscillatory movement of the secondary electrons between the targets the latter acting as electric mirrors. Indium was evaporated from a BN oven. In the course of our studies the composition of the films, controlled by RBS and EDX, was varied between ± 30 % for the three elements and the growth temperature ranged from 500 to 750 ^∘ C. The films obtained so far showed transition temperatures between 1.5 and 2.0 K and the characteristic maximum in resistivity near 40 K.