Nonlocal vs local vortex dynamics in the transversal flux transformer effect

Abstract

In this follow-up to our recent Letter [F. Otto et al., Phys. Rev. Lett. 104, 027005 (2010)], we present a more detailed account of the superconducting transversal flux transformer effect (TFTE) in amorphous (a-)NbGe nanostructures in the regime of strong nonequilibrium in local vortex motion. Emphasis is put on the relation between the TFTE and local vortex dynamics, as the former turns out to be a reliable tool for determining the microscopic mechanisms behind the latter. By this method, a progression from electron heating at low temperatures T to the Larkin-Ovchinnikov effect close to the transition temperature Tc is traced over a range 0.26 < T/Tc < 0.95. This is represented by a number of relevant parameters such as the vortex transport entropy related to the Nernst-like effect at low T, and a nonequilibrium magnetization enhancement close to Tc. At intermediate T, the Larkin-Ovchinnikov effect is at high currents modified by electron heating, which is clearly observed only in the TFTE.

References in corpus (5)

• Unstable flux flow due to heated electrons in YBaCuO films
• Long-range nonlocal flow of vortices in narrow superconducting channels
• Nonlocal vortex motion in mesoscopic amorphous Nb0.7Ge0.3 structures
• Reversal of Nonlocal Vortex Motion in the Regime of Strong Nonequilibrium
• Strongly nonequilibrium flux flow in the presence of perforating submicron holes

Cited by in corpus (1)

• Competition between intrinsic and extrinsic effects in the quenching of the superconducting state in FeSeTe thin films