Unstable flux flow due to heated electrons in YBaCuO films

Abstract

A flux instability occurs in superconductors at low temperatures, where ee scattering is more rapid than ep, whereby the dissipation significantly elevates the electronic temperature while maintaining a thermal-like distribution function. The reduction in condensate and rise in resistivity produce a non-monotonic current-voltage response. In contrast to the Larkin-Ovchinnikov instability where the vortex shrinks, in this scenario the vortex expands and the quasiparticle population rises. Measurements in YBaCuO agree quantitatively with the distinct predictions of this mechanism.

Accepted for publication in Phys. Rev. Lett. on Aug. 5, 2002; 4 pages, 4 figures

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