[en] We explore, with unprecedented single vortex resolution, the dissipation and motion of vortices in a superconducting ribbon under the influence of an external alternating magnetic field. This is achieved by combining the phase sensitive character of ac susceptibility, allowing us to distinguish between the inductive and dissipative responses, with the local power of scanning Hall probe microscopy. Whereas the induced reversible screening currents contribute only inductively, the vortices do leave a fingerprint in the out-of-phase component. The observed large phase-lag demonstrates the dissipation of vortices at time scales comparable to the period of the driving force (i.e., 13 ms). These results indicate the presence of slow microscopic loss mechanisms mediated by thermally activated hopping transport of vortices between metastable states.
Disciplines :
Physics
Author, co-author :
Raes, B; Katholieke Universiteit Leuven - KUL
Van de Vondel, J; Katholieke Universiteit Leuven - KUL
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Souza Silva, C; Universidade Federal de Pernambuco, Brazil
Gutierrez, J; Katholieke Universiteit Leuven - KUL
Kramer, R; Institute Néel, Grenoble
Moshchalkov, V; Katholieke Universiteit Leuven - KUL
Language :
English
Title :
Local mapping of dissipative vortex motion
Publication date :
23 August 2012
Journal title :
Physical Review. B, Condensed Matter
ISSN :
0163-1829
eISSN :
1095-3795
Publisher :
American Institute of Physics, New York, United States - New York
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