Regensburg 2002 – scientific programme

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Syst. korr. Elektr.: Theorie II (1-15), Metall-Isol.- und Phasenüberg
änge (16-33), SL: Massivmat., Bandl., Pinning, Vortexdyn., Transport, Korngr. (34-43), Niedrigdim. Syst., Magnetotransport (44-63)

TT 22.43: Poster

Thursday, March 14, 2002, 14:00–17:30, A

Preparation, Scaling Behavior of Activation Energy, and Anisotropy of (Hg_0.9Re_0.1) Ba₂CaCu₂O_6+δ HTS Thin Films — •Abouelwafa Salem, Gerhard Jakob, Michael Basset, and Hermann Adrian — Institut für Physik Mainz Universität Staudinger-weg 7 D-55099 Mainz Germany

High-quality epitaxial (Hg_0.9Re_0.1)Ba₂CaCu₂O_6+δ HTS thin films were prepared by pulsed laser deposition (PLD) of precursor material on (100)-oriented SrTiO₃ substrates with subsequent Hg vapour annealing. The films exhibit sharp superconducting transitions at T_c≈120 K. The activation energy for thermally activated flux-creep has been determined as a function of temperature and dc magnetic fields up to 6 T parallel and perpendicular to the crystallographic c-axis.
To study the anisotropic properties of the vortex state, measurements of the depinning field on epitaxially grown Hg-1212 films were performed under variation of the of the angle θ between the field direction and the c-axis of the film with high angular resolution ( Δ θ ≈ 0.1 ^∘). The measured angular dependence of the depinnig field B_dp shows a cusp for θ = 90^∘. The complete angular dependence B_dp(θ) can be explained completely by taking into account the anisotropy of the upper critical field.