882 research outputs found
Die Seelen beruhigende Gelassenheit Derer Kinder Gottes : Ward Am 3. Sonntage nach Epiphan. einer Christlichen Gemeinde Jn der Universitäts-Kiche Zu Leipzig vorgestellet / Von D. Gottfried Oleario, Theol. Prof. Publ.
No full textFingerprint nach Ex. der Bibl. der Franckeschen Stiftungen zu Halle und der ULB Sachsen-AnhaltVorlageform des Erscheinungsvermerks: Leipzig, Druckts Johann Gottlieb Bauch. Anno M DCC XIII
Submicron YBaCuO biepitaxial Josephson junctions: d-wave effects and phase dynamics
No full textWe report a systematic study of the transport properties of high critical temperature superconductor (HTS) biepitaxial Josephson junctions in the submicron range. Junction performances point to more uniform and reproducible devices and to better control of d-wave intrinsic properties. Outcomes promote novel insights into the transport mechanisms across grain boundaries and encourage further developments in the control of dissipation in HTS devices. The application of nanotechnology to HTS could be an additional tool to properly engineer the junction properties to match specific circuit design also in view of the integration into hybrid quantum circuits. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3388035
Fabrication and properties of sub-micrometric YBCO biepitaxial junctions
No full textWe report on the fabrication procedure and the transport properties of submicron grain boundary biepitaxial YBCO Josephson junctions. These first results are very encouraging and justify further expectations on improved performances for such types of devices. A reduced and more controlled faceting along the grain boundary interface, for instance, will better preserve intrinsic d-wave effects, and favour the study of fluxons dynamics
Eck-Like Resonances in High-Long Faceted Josephson Junctions
No full textBy means of numerical simulations we study the dynamics
of the phase difference in faceted long Josephson junctions.
We compare our simulations with experiments on a sample of high
quality high- biepitaxial junctions. Adjusting junction length
and dissipation to reproduce the observed data we found a significant
agreement, which permits to identify the observed resonances
mostly as Eck steps. Some considerations are also made on the requirements
to observe flux-flow or Fiske resonances in these junctions
Fabrication and properties of sub-micrometric YBCO biepitaxial junctions
No full textWe report on the fabrication procedure and the transport properties of submicron grain boundary biepitaxial YBCO Josephson junctions. These first results are very encouraging and justify further expectations on improved performances for such types of devices. A reduced and more controlled faceting along the grain boundary interface, for instance, will better preserve intrinsic d-wave effects, and favour the study of fluxons dynamics
Flavours of intrinsic d-wave induced effects in YBa2Cu3O7-d grain boundary Josephson junctions
No full textThe quality of YBa2Cu3O7−δ biepitaxial grain boundary Josephson
junctions has been improved and ‘tunnel-like’ characteristics are
reproducibly obtained. The consequent low barrier transmission
probabilities are apparently favourable to isolate intrinsic d-wave induced
effects. Extrinsic and intrinsic d-wave effects are discussed within the
framework of novel designs for π-circuitry and qubits
Dynamics of d-wave YBa2Cu3O7-x
No full textThe predominant d-wave pairing symmetry in high temperature superconductors leads to an unconventional current phase relation in Josephson junctions. This circumstance may induce new effects in the dynamics of dc SQUIDs. In this contribution we report on the measurements of the dependence of the SQUID Josephson current on the external magnetic field taken at very low temperatures, down to 20 mK. Different grain boundaries have been fabricated by using the biepitaxial and the bicrystal technique. Some of the effects which are induced by a nonsinusoidal current phase relation can be clearly identified in the dynamics of the SQUIDs. The experimental data are also compared with theoretical simulations taking into account the inductance of the loop. The data show that, in specific conditions, a non-negligible inductance of the loop can induce effects similar to an unconventional current phase relation, with a pronounced second harmonic sin(2) term. This fact has to be taken into account when designing d-wave SQUIDs for quantum circuitry
Quantum dynamics of a d-wave Josephson junction
No full textHere we present the direct observation of macroscopic quantum properties in an all high-criticaltemperature superconductor d-wave Josephson junction. Although dissipation caused by low-energy excitations is expected to strongly suppress macroscopic quantum effects, we demonstrate energy level quantization in our d-wave Josephson junction. The result indicates that the role of dissipation mechanisms in high-temperature superconductors has to be revised, and it may also have consequences for the class of solid-state ‘‘quiet’’ quantum bits with superior coherence time
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