Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor

Details Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor Observation of a New Mechanism of Spontaneous Generation of Magnetic Flux in a Superconductor

2004-11-02

arxiv.org/abs/cond-mat/0411051v2

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.94.247005

We report the discovery of a new mechanism of spontaneous generation of a magnetic flux in a superconductor cooled through $T_c$. The sign of the spontaneous flux changes randomly from one cooldown to the next, and follows 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.

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