Characteristics of advanced YBa2Cu30,/PrBa2Cu30~~Y~a*Cu~O~ edge type junctions
نویسندگان
چکیده
This letter describes the scaling behavior and Josephson properties of improved YBCO/PBCO/ YBCO edge-type junctions. The critical current, normal-state resistance, and I& product scale with barrier thickness and junction area. The coherence length of the PBCO barrier is estimated to be between 5 and 8 nm. As unambiguous evidence of the Josephson behavior, the microwave response as a function of microwave power, as well as the current modulation with applied magnetic field, have been studied: well-developed Shapiro steps at 10 GHz have been observed, and the modulation of I,(H) shows Fraunhoferlike behavior with 95% Ic suppression.
منابع مشابه
Junction Characteristics and Magnetic Field Dependencies of Low Noise Step Edge Junction Rf-SQUIDs for Unshielded Applications
Step edge grain boundary (GB) junctions and rfSQUIDs have been made using pulsed laser deposited Y-Ba-Cu-O films on crystalline LaAlO3 substrates. The steps were developed using various ion-beam etching processes resulting in sharp and ramp type step structures. Sharp step based GB junctions showed behavior of serial junctions with resistively shunted junction (RSJ)-like characteristics. The ra...
متن کاملAnalysis of electrical characteristics and magnetic field dependences of YBCO step edge and bicrystal grain boundary junctions for rf-SQUID applications
The dc characteristics and magnetic field dependences of Y–Ba–Cu–O bicrystal grain boundary junctions (BGBJs) and step edge junctions (SEJs) were investigated for fabrication of rf-SQUIDs. Test junctions with up to 8 μm widths as well as the junctions of the two types of junction-based rf-SQUID were studied. The SEJs typically showed lower Jc and higher ρN as compared to the BGBJs, resulting in...
متن کاملThe Energy Dispersion of the Chain Band in YBa2Cu30 6+J and Its Effect on the Cu(2) NQR Frequency*
für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namen...
متن کاملNuclear Quadrupole Resonance Study of Copper in Electron-Irradiated YBa2Cu30
NQR of Cu in YBa2Cu3O ö 95 was investigated before and after low-temperature electron irradi ation as well as after annealing at several distinct temperatures up to 440 K. Irradiation with 2.76 MeV electrons (fluence (f)t = 2.2 ■ 1023 e_/m2) decreased the critical temperature Tc from 91.8 K to 89.5 K. The NQR spectra indicate that the e~ irradiation displaces so-called 0(4) atoms in the Cu-O c...
متن کاملLaser-induced modification of transport properties of Y–Ba–Cu–O step-edge weak links
We report on the laser-induced permanent changes of the critical current (Ic) and normal resistance (Rn) of YBa2Cu3O72x ~YBCO! step-edge Josephson junctions. The 2to 20-mm-wide junctions were prepared from a 200-nm-thick YBCO film deposited by a pulsed KrF excimer laser onto 300-nm-high steps etched in the LaAlO3 substrate. The laser modification experiments were performed by illuminating the j...
متن کامل