Inhaltszusammenfassung

We have prepared fully textured (Hg0.9Re0.1)Ba2CaCu2O6 ? (HgRe-1212) thin films by pulsed laser deposition (PLD) and post-annealing. The films exhibit sharp superconducting transitions at Tc=124 K with transition width ?Tc2 K. Conditions for reproducible film preparation have been found. The resistive transitions have been investigated in magnetic fields up to 8 T (parallel to the c-axis) and 10 T (perpendicular to the c-axis). We have determined the activation energy of thermally activated f...We have prepared fully textured (Hg0.9Re0.1)Ba2CaCu2O6 ? (HgRe-1212) thin films by pulsed laser deposition (PLD) and post-annealing. The films exhibit sharp superconducting transitions at Tc=124 K with transition width ?Tc2 K. Conditions for reproducible film preparation have been found. The resistive transitions have been investigated in magnetic fields up to 8 T (parallel to the c-axis) and 10 T (perpendicular to the c-axis). We have determined the activation energy of thermally activated flux-motion for both magnetic field orientations. The Hall resistivity (?xy) of HgRe-1212 superconductor thin films has been measured in the ab-plane at 8 T. In the mixed state a power-law behavior is observed, where ?xy scales to a power-law function of ?xx: ?xy=A??xx, with ?=1.4±0.1. Above 130 K the T2 dependence of the cotangent of the Hall angle is observed. At different temperatures magnetization loops were measured with a magnetic field applied normal to the film in a SQUID magnetometer and the corresponding critical current densities Jc were calculated. Under variation of the angle ? between the field direction and the c-axis of the film the anisotropic properties of the vortex state and the depinning field Bdp(?) have been studied. The measured angular dependence Bdp(?) shows a cusp for ?=90°. The films exhibit a rather low critical field anisotropy of 7.7. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik