Flux noise and flux creep in YBCO thin films

Flux creep and flux jumping.

The flux jump instability of Bean’s critical state in the flux-creep regime of type-II superconductors is considered. We find the flux-jump field B j which determines stability criterion of the superconducting state. The dependence of B j on the external magnetic-field ramp rate Ḃe is calculated. We demonstrate that under the conditions typical for most of the magnetization experiments the slop...

Flux jumping in thin films.

The thermomagnetic flux-jump instability of the Bean critical state is considered, which may occur during flux penetration in thin films of type-II superconductors in a perpendicular magnetic field. We calculate the applied field B j at which this instability occurs and its dependence on the ramp rate Ḃa , on the nonlinear current-voltage curve, and on the thermal resistance between the film an...

Modeling flux pinning in thin undoped and BazRo3-doped YBCO films

Dendritic and homogeneous regimes of flux penetration into YBCO films

Dendrltlc flux palleriic in superconducting YBCO films are studled on a niulosecond t~me-scale. I l ir fourid that delld~rtes only develop fbr certarn v;llucs uf !he exlerr~al field and tetnperaturc. 8 2003 Puhlished by Elsewer Sclencc 0.1'. K ~ y l w r d ~ : YBalculu;: Flux propagation. Fl~lu front instnhility; Flux dendrites Tt is well-known that superconductors carrying high critical current...

Flux Pinning Effects of Y2o3 Nanoparticulate Dispersions in Multilayered Ybco Thin Films (postprint)

The flux pinning effects of Y2O3 nanoparticulate inclusions in YBa2Cu3O7 d (Y123 or YBCO) thin films using (Y2O3/Y123) · N multilayer structures were studied. The multilayer films were made with pulsed laser deposition (PLD) on SrTiO3 and LaAlO3 substrates with a Y2O3 nanoparticulate pseudo-layer thickness ranging from 0.2 to 1.4 nm, and YBCO layer thickness varying from 7 to 50 nm. Scanning el...