Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.8: Poster
Montag, 31. März 2014, 15:00–19:00, P2
Delta-doped La2−x(Sr,Ba)xCuO4 thin films grown by oxide molecular beam epitaxy — •Christopher Dietl, Federico Baiutti, Meng Wu, Georg Cristiani, Gennady Logvenov, Eva Benckiser, and Bernhard Keimer — Max-Planck-Institute for Solid-State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
We investigate the possibility of delta-doping LCO thin films by replacing selectively LaO-layers by SrO or BaO. In this fashion, a modulated dopant distribution is created, which is predicted to enhance spin fluctuations and thus TC [1]. The necessary atomic layer-by-layer growth capability is achieved with a state of the art Molecular Beam Epitaxy (MBE) setup allowing to grow films with typical surface roughnesses of ≈ 5Å. Oxidization of copper under high vacuum is performed via ozone. The growth is monitored in-situ by Reflection High Energy Diffraction (RHEED) for qualitative stochiometry control. Characterization is performed via XRD, XRR and AFM. The superlattices show superconductivity with the highest critical temperature being Tc=35K.
T. Jarlborg, Appl. Phys. Lett. 94, 212503 (2009)