Inhaltszusammenfassung

By DC-sputtering from a single stoichiometric target we prepared high quality YBa2Cu3O7 thin films on SrTiO3, LaGaO3, ZrO2, MgO and NdAlCaO4. All films sputtered on these substrates (except NdAlCaO4) showed narrow inductive transitions (ΔTc < 2K) and high-Tc (> 86 K), but only on LaGaO3 the transition was as sharp (width < 0.5 K) and Tc as high (90 K) as on SrTiO3. The superior quality of LaGaO3 and SrTiO3 was also confirmed by X-ray analysis. We obtained narrow resistive transitions (ΔTc < 0...By DC-sputtering from a single stoichiometric target we prepared high quality YBa2Cu3O7 thin films on SrTiO3, LaGaO3, ZrO2, MgO and NdAlCaO4. All films sputtered on these substrates (except NdAlCaO4) showed narrow inductive transitions (ΔTc < 2K) and high-Tc (> 86 K), but only on LaGaO3 the transition was as sharp (width < 0.5 K) and Tc as high (90 K) as on SrTiO3. The superior quality of LaGaO3 and SrTiO3 was also confirmed by X-ray analysis. We obtained narrow resistive transitions (ΔTc < 0.5 K) and high critical current densities jc (77 K, B = 0) up to 3 × 106 A/cm2 measured on a 100 μm long microbridge. So far only films on SrTiO3 were wet chemically patterned. Furthermore the preparation of epitaxial YBa2 (Cu1−xZnx)3O7 films on SrTiO3 is reported for the first time. The structural properties of these films are not affected by Zn doping up to 10%. The superconducting Tc decreases linearly with = as observed in bulk samples. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik