“Chain Scenario” for Josephson Tunneling withπShift in YBa2Cu3O7

Tunneling characteristics of internal Josephson junctions in YBa2Cu3O7- delta thin films.

Observation of Splintered Josephson Vortices at Grain Boundaries in YBa2Cu3O7

067004-1 We have directly observed well-separated Josephson vortex splinters with unquantized magnetic flux at asymmetric 45 grain boundaries in YBa2Cu3O7 films by imaging magnetic flux with scanning SQUID microscopy. The existence of these splinter vortices has been predicted and is well described by a model based on dx2 y2 pairing symmetry and facetting of the grain boundary on a length scale...

Phonon assisted tunneling in Josephson junctions

The expression for additional subgap current in the presence of electron– phonon interaction is derived. We show that the phonon assisted tunneling leads to the appearance of peaks on current-voltage characteristics at the Josephson frequencies corresponding to the Raman-active phonons. The relation of the obtained results to the experimental observation are discussed. 72.20 Fg., 74.50.+r Types...

Noise Properties of YBa2Cu3O7 Josephson Junction Array Magnetometers

We have fabricated magnetometers based on the magnetic field dependence of the critical current of 24Æ bicrystal Josephson junctions from the high temperature superconductor (HTS) YBa2Cu3O7. The field sensitivity is increased with additional flux focusers up to @Ic=@B = 130 A/T. Because the voltage modulation and signal-to-noise ratio increases with the number of junctions, serial arrays of up ...

Spin-polarized tunneling of La0.67Sr0.33MnO3/YBa2Cu3O7−δ junctions