Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 1: Superconductivity - Fabrication, Technical Optimization and Characterization

TT 1.11: Vortrag

Freitag, 4. März 2005, 12:45–13:00, TU H104

Normal and mixed state Hall effect in (Hg_0.9Re_0.1) Ba₂CaCu₂O_6+δ fully textured HTSC thin films — •Abouelwafa Salem, Gerhard Jakob, and Hermann Adrian — Institut für Physik, Johannes Gutenberg-Universität, 55099

Temperature and magnetic field dependence of the Hall effect in the normal and mixed state of fully textured (Hg_0.9Re_0.1)Ba₂CaCu₂O_6+δ (HgRe-1212) HTSC thin films prepared by laser ablation deposition have been studied. The longitudinal resistivity ρ_xx and Hall resistivity ρ_yx of HgRe-1212 superconductor thin films were measured for a wide range of magnetic fields up to 12 T with the field perpendicular to the ab plane and the current in the ab plane. A sign change of the Hall resistivity is observed in fields below 3 T in the region close to the superconducting onset temperature. The temperature dependencies ρ_xx ∝ T and ρ_yx∝ 1/T have been observed for HgRe-1212 thin films. Anderson’s formula for the Hall angle θ_H, namely cot θ_H= α T² + β, remains valid for temperatures T above T_c. In the mixed state a power-law behavior is observed, where ρ_yx scales to a power-law function of ρ_xx: ρ_yx = A ρ_xx^β, with β increasing from 1.0 to 1.7 as the field increases from 1 to 12 T.