Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor
Ariel Maniv, Emil Polturak, Gad Koren, Yuri Bliokh, Björn Biehler, Bernd-Uwe Runge, Paul Leiderer, Boris Shapiro, Irena Shapiro
DOI 10.1103/PhysRevLett.94.247005 · Physical Review Letters
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Abstract
We report the discovery of a new mechanism of spontaneous generation of a magnetic flux in a superconductor cooled through Tc. Values of the spontaneous flux appear random from one cooldown to the next, following a Gaussian distribution. The width of the distribution increases with the size of the temperature gradient in the sample. Our observations appear inconsistent with the well-known mechanisms of flux generation. The dependence on the temperature gradient suggests that the flux may be generated through an instability of the thermoelectric superconducting-normal quasiparticle counterflow.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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