Inhaltszusammenfassung

Biepitaxial Josephson junctions were fabricated on MgO and SrTiO3 (STO) substrates. Electrical characteristics such as the critical current densities Jc, contact resistivities ?n and IcRn-products on both substrates are investigated. Junctions on MgO substrates are stable against thermal cycling in contrast to many junctions on STO substrates. The obtained current-voltage characteristics and Shapiro step oscillations are in agreement with the RSJ-model. The resistive transitions are strongly ...Biepitaxial Josephson junctions were fabricated on MgO and SrTiO3 (STO) substrates. Electrical characteristics such as the critical current densities Jc, contact resistivities ?n and IcRn-products on both substrates are investigated. Junctions on MgO substrates are stable against thermal cycling in contrast to many junctions on STO substrates. The obtained current-voltage characteristics and Shapiro step oscillations are in agreement with the RSJ-model. The resistive transitions are strongly broadened. DC-SQUIDs patterned on both substrates show modulations dV/d? at 77 K. At 55 K the energy resolution ε in the range of white noise lies within a factor of two of the theoretical limit.» weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Physik der kondensierten Materie

DDC Sachgruppe:
Physik