Inhaltszusammenfassung

Thin films of YBa2Cu3O7 were deposited on (1120) Al2O3 by laser ablation. X-ray diffraction analysis revealed that the films grow c-axis oriented. The FWHM of the rocking curves were determined to 2.1 degrees for films prepared at substrate temperatures of Ts>or=830 degrees C, exhibiting typical inductively measured Tc-values around 87 K (transition width around 1 K). By means of ESCA depth profiles the diffusion of the AI of the substrate into the superconducting film was analysed. The resis...Thin films of YBa2Cu3O7 were deposited on (1120) Al2O3 by laser ablation. X-ray diffraction analysis revealed that the films grow c-axis oriented. The FWHM of the rocking curves were determined to 2.1 degrees for films prepared at substrate temperatures of Ts>or=830 degrees C, exhibiting typical inductively measured Tc-values around 87 K (transition width around 1 K). By means of ESCA depth profiles the diffusion of the AI of the substrate into the superconducting film was analysed. The resistivity rho (T) is approximately=500 mu Omega cm at 300 K and exhibits the typical linear temperature dependence with rho (300 K)/ rho (100 K) approximately=2. In magnetic fields B up to 12 T with the field direction perpendicular to the film surface rho (T) as well as the critical current density jc(T) were monitored. The resistive transition shows only little broadening at B=12 T and Tc,zero is shifted to 75 K, whereas for jc(T) a strong reduction in magnetic field is observed.» weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik