Nonlocal versus local vortex dynamics in the transversal flux transformer effect

Florian Otto, Ante Bilušić, Dinko Babić, Denis Yu. Vodolazov, Christoph Sürgers, and Christoph Strunk
Phys. Rev. B 81, 174521 – Published 20 May 2010

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 0.26T/Tc0.95. This is represented by a number of relevant parameters such as the vortex transport entropy related to the Nernst-type 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.

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  • Received 24 March 2010

DOI:https://doi.org/10.1103/PhysRevB.81.174521

©2010 American Physical Society

Authors & Affiliations

Florian Otto1,*, Ante Bilušić1,2, Dinko Babić3, Denis Yu. Vodolazov4, Christoph Sürgers5, and Christoph Strunk1

  • 1Institute for Experimental and Applied Physics, University of Regensburg, D-93025 Regensburg, Germany
  • 2Faculty of Natural Sciences, University of Split, N. Tesle 12, HR-21000 Split, Croatia
  • 3Department of Physics, Faculty of Science, University of Zagreb, Bijenička 32, HR-10000 Zagreb, Croatia
  • 4Institute for Physics of Microstructures, Russian Academy of Sciences, 603950, Nizhny Novgorod GSP-105, Russia
  • 5Karlsruhe Institute of Technology (KIT), Physikalisches Institut and DFG-Center for Functional Nanostructures, P.O. Box 6980, D-76049 Karlsruhe, Germany

  • *Present address: Attocube systems AG, Germany.

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Vol. 81, Iss. 17 — 1 May 2010

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