Inhaltszusammenfassung

YBa2Cu3O7 films were deposited by inverted cylindrical magnetron sputtering on metallic substrates as e.g. Ni sheet covered with the natural oxide as barrier layer. These films grow c-axis oriented with a Tc,R=0 of about 80 K. For a better understanding of the growth procedure on metal oxides, thin YBa2Cu3O7 films were prepared on single crystalline NiO with the orientations (100), (110) and (111). These films are also c-axis oriented and exhibit Tc R = 0 =86K. So far (100) oriented NiO yield...YBa2Cu3O7 films were deposited by inverted cylindrical magnetron sputtering on metallic substrates as e.g. Ni sheet covered with the natural oxide as barrier layer. These films grow c-axis oriented with a Tc,R=0 of about 80 K. For a better understanding of the growth procedure on metal oxides, thin YBa2Cu3O7 films were prepared on single crystalline NiO with the orientations (100), (110) and (111). These films are also c-axis oriented and exhibit Tc R = 0 =86K. So far (100) oriented NiO yields the best results, as can be seen from the rocking curve with FWHH= .4°, from channeling measurements and from the critical current density Jc,77K,B=0=105A/cm2. Even in a magnetic field of 12 T with Bc-axis the critical current density at 50 K exceeds 105 A/cm2. On other substrate orientations Jc is much smaller. Similar investigations were performed on the Cu/Cu2O/YBa2Cu3O7-system. Films on polycrystalline Cu2O exhibit metallic R(T) behavior with Tc,R=0 ? 80 K. First results on single crystalline Cu2O substrates are quite promising. » weiterlesen» einklappen

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Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik