0000000000682434

AUTHOR

K. ÜStüner

showing 3 related works from this author

Transport properties of Bi2Sr2Ca2Cu3O10+δ Bicrystal Grain Boundary Josephson Junctions and SQUIDs

1996

Josephson junctions and SQUIDs on 36.8° SrTiO 3 bicrystal substrates were prepared from epitaxial Bi 2 Sr 2 Ca 2 Cu 3 O 10+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 0.7mV at 4.2K have been reached. The I c (B) dependence is symmetric to B = 0 with an I c suppression of 90% in the first minimum. Nevertheless it turns out, that the junctions are inhomogeneous on a μm scale. SQUID modulations observed at 78K indicate a flux-voltage transfer function of 2.7μV/Φ 0 at this temperature.

010302 applied physicsPhysicsJosephson effectCondensed matter physicsGeneral Physics and AstronomyEpitaxy01 natural scienceslaw.inventionSQUIDlaw[PHYS.HIST]Physics [physics]/Physics archives0103 physical sciencesGrain boundaryThin film010306 general physics
researchProduct

Bi2Sr2Ca2Cu3O10+δ based Josephson junctions and SQUIDs

1996

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.

Josephson effectSQUIDPi Josephson junctionMaterials scienceCondensed matter physicsJosephson phaselawGeneral Physics and AstronomyJosephson energyThin filmEpitaxylaw.inventionCzechoslovak Journal of Physics
researchProduct

Josephson junctions and superconducting field effect transistors based on epitaxial Bi2Sr2Can-1CunO2(n+2) thin films

1998

Abstract Josephson junctions based on thin films of the Bi2Sr2Ca2Cu3O10+δ compound show IcRn products compatible with YBa2Cu3O7−δ samples. Using quasiparticle tunneling experiments we found evidence for a superconductor–insulator–superconductor tunneling process via localized states in the barrier. The Bi2Sr2CaCu2O8+δ compound is investigated regarding possible applications in superconducting field effect devices. We present thin films of four unit cells thickness that are superconducting at 58 K. An inverted metal–insulator–superconductor structure was prepared. From the modulation of the normal state resistance we estimate a carrier density of 7×1019 cm−3 for a superconducting sample. The…

SuperconductivityPi Josephson junctionJosephson effectMaterials scienceCondensed matter physicsCondensed Matter::SuperconductivityTransition temperatureGeneral EngineeringGeneral Physics and AstronomyField effectField-effect transistorThin filmQuantum tunnellingApplied Superconductivity
researchProduct