Article (Scientific journals)
Field-dependent vortex pinning strength in a periodic array of antidots
Silhanek, Alejandro; Raedts, S.; Lange et al.
2003In Physical Review. B, Condensed Matter and Materials Physics, 67 (6)
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Keywords :
superconductivity
Abstract :
[en] We explore the dynamic response of vortex lines in a Pb thin film with a periodic array of antidots by means of ac-susceptibility measurements. For low drive field amplitudes, within the Campbell regime, vortex motion is of intravalley type and the penetration depth is related to the curvature of the pinning potential well alpha. For dc fields below the first matching field H-1, alpha reaches its highest value associated with a Mott insulator like phase where vortex lines are strongly localized at the pinning sites. For H-1<H-dc<H-2, the response is mainly due to the interstitial vortices and α drops to smaller values as expected for this metallic like regime. Strikingly, for H-2<H-dc<H-3, we observe that α reduces further down. However, for H-3<H-dc<H-4, a reentrance in the pinning strength is observed, due to a specific configuration of the flux-line lattice which strongly restricts the mobility of vortices. We present a possible explanation for the measured α(H-dc) dependence based on the different flux-line lattice configurations.
Disciplines :
Physics
Author, co-author :
Silhanek, Alejandro  ;  Katholieke Universiteit Leuven - KUL
Raedts, S.;  Université de Liège - ULiège > Département de droit > Département de droit
Lange
Moshchalkov, V. V.
Language :
English
Title :
Field-dependent vortex pinning strength in a periodic array of antidots
Publication date :
2003
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Institute of Physics, New York, United States - New York
Volume :
67
Issue :
6
Peer reviewed :
Peer Reviewed verified by ORBi
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