Inhaltszusammenfassung

Single-phase bulk-YBa2Cu3O9-? was prepared by solid-state reaction under oxygen atmosphere as well as exclusively in air, observing a transition from semi- to superconducting behaviour depending on the preparation. Low temperature powder x-ray diffraction from 300K down to 10K was carried out to investigate the structure. The upper critical field is estimated to Bc2 (T=0) = 110T (Tc-midpoint), critical current densities of up to 180A/cm2 are determined at different temperatures in magnetic fi...Single-phase bulk-YBa2Cu3O9-? was prepared by solid-state reaction under oxygen atmosphere as well as exclusively in air, observing a transition from semi- to superconducting behaviour depending on the preparation. Low temperature powder x-ray diffraction from 300K down to 10K was carried out to investigate the structure. The upper critical field is estimated to Bc2 (T=0) = 110T (Tc-midpoint), critical current densities of up to 180A/cm2 are determined at different temperatures in magnetic fields up to 7T. Photoemission experiments show, that grains are only coupled by semiconducting interfaces and reveal a strong hybridization between O-2p and Cu-3d states. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik