TY - JOUR
T1 - Flux distributions of an artificially granular YBa2Cu3O7-δ thin film observed using magneto-optic imaging
AU - Koblischka, M. R.
AU - Půst, L.
AU - Johansen, T. H.
AU - Nilsson, B.
AU - Claeson, T.
N1 - Funding Information:
Valuable discussions with Y. Galperin (University of Oslo), D.V. Shantsev (on leave from Ioffe Institute, St. Petersburg, Russia), A.A. Polyanskii (University of Madison) and J.R. Clem (Iowa State University) are gratefully acknowledged. We also like to thank V. Gregor and S. Danis (ASCR Prague) for technical assistance during the early stages of the experiments. This work is supported by The Research Council of Norway; L.P. acknowledges support from NATO by grant No. 961357.
PY - 2000/4/15
Y1 - 2000/4/15
N2 - Flux distributions in a YBa2Cu3O7-δ thin film with artificial granularity are observed by means of magneto-optic imaging. At low magnification, flux patterns generated exclusively by the intergranular currents flowing in the intergranular area (`effective medium') are directly observed. The properties of this effective medium are studied by taking flux density profiles that reveal the intergranular current density. As the observations at high magnifications show the flux penetration and pinning within the individual disks, we can identify and study the different contributions of the intergranular and intragranular current densities to the flux patterns. We show that our model sample reproduces several features observed, e.g., in Ag-sheathed (Pb,Bi)2Sr2Ca2Cu3O10+δ tapes.
AB - Flux distributions in a YBa2Cu3O7-δ thin film with artificial granularity are observed by means of magneto-optic imaging. At low magnification, flux patterns generated exclusively by the intergranular currents flowing in the intergranular area (`effective medium') are directly observed. The properties of this effective medium are studied by taking flux density profiles that reveal the intergranular current density. As the observations at high magnifications show the flux penetration and pinning within the individual disks, we can identify and study the different contributions of the intergranular and intragranular current densities to the flux patterns. We show that our model sample reproduces several features observed, e.g., in Ag-sheathed (Pb,Bi)2Sr2Ca2Cu3O10+δ tapes.
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U2 - 10.1016/S0921-4534(99)00617-6
DO - 10.1016/S0921-4534(99)00617-6
M3 - Article
AN - SCOPUS:0343192481
SN - 0921-4534
VL - 331
SP - 113
EP - 126
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 2
ER -