Observation of Spontaneous Flux Generation in a Multi-Josephson-Junction Loop
Raz Carmi, Emil Polturak, Gad Koren
DOI 10.1103/PhysRevLett.84.4966 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We describe observations of spontaneous flux generation inside a YBa2Cu3O7−δ loop made of 214 Josephson junctions in series. The flux is generated spontaneously during cooldown into the superconducting state. The experiment is motivated by the Kibble-Zurek scenario of formation of topological defects in condensed matter systems. The transition from decoupled superconducting segments into a coherent loop is determined by the strength of thermal fluctuations in the junctions. Values of the flux measured at the end of each cooldown follow a normal distribution, and are consistent with the instantaneous phase differences across the junctions adding up as the loop becomes coherent.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
Similar papers
Intrinsic Josephson effects in YBa2Cu3O7−δ single crystals with various oxygen deficiencies
similarity 0.95H. B. Wang et al.
Source status unknown — claims are unverified
Observation of Magnetic Flux Generated Spontaneously During a Rapid Quench of Superconducting Films
similarity 0.94A. Maniv et al.
Source status unknown — claims are unverified
Josephson-flux depinning in granular YBa2Cu3O7−δ
similarity 0.94J. Jung et al.
Source status unknown — claims are unverified
Possible Josephson oscillations spectra and electron paramagnetic resonance of Cu2+ in Y-Ba-Cu-O
similarity 0.93J. Stankowski et al.
Source status unknown — claims are unverified
Fraunhofer oscillations in a multilayer system with Josephson coupling of layers
similarity 0.93L. N. Bulaevskii et al.
Source status unknown — claims are unverified
Microwave heating of a high-Tc YBa2Cu3O6.9 superconductor through a Josephson-junction system
similarity 0.93J. Stankowski et al.
Source status unknown — claims are unverified