6533b831fe1ef96bd1298317

RESEARCH PRODUCT

Bi2Sr2Ca2Cu3O10+δ based Josephson junctions and SQUIDs

U. FreyK. ÜStünerH. MeffertGerhard JakobH. AdrianP. Haibach

subject

Josephson effectSQUIDPi Josephson junctionMaterials scienceCondensed matter physicsJosephson phaselawGeneral Physics and AstronomyJosephson energyThin filmEpitaxylaw.invention

description

Josephson junctions and SQUIDs on SrTiO3 bicrystal substrates were prepared from epitaxial Bi2Sr2Ca2Cu3O10+δ thin films with critical temperatures around 95K. The current-voltage characteristics are well described by the resistively and capacitively shunted junction model.I c R n products of 50μV at 77K and 0.7m V at 4.2K have been reached. TheI c (B) dependence is symmetric toB=0 with anI c suppression of 90% in the first minimum. Nevertheless it turns out, that the junctions are inhomogeneous on a μm scale. The flux-voltage transfer function of a SQUID reached 2.7μV/Ф0 at 78K.

https://doi.org/10.1007/bf02562759