Experimental determination of the number of flux lines trapped by microholes in superconducting samples

Silhanek, Alejandro; Raedts, S.; Van Bael, M. J.; Moshchalkov, V. V.

doi:10.1103/PhysRevB.70.054515

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Experimental determination of the number of flux lines trapped by microholes in superconducting samples

Silhanek, Alejandro; Raedts, S.; Van Bael, M. J. et al.

2004 • In Physical Review. B, Condensed Matter and Materials Physics, 70 (5)

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https://hdl.handle.net/2268/102944

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10.1103/PhysRevB.70.054515

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Keywords :

superconductivity

Abstract :

[en] The influence of a periodic landscape of pinning sites on the vortex dynamics in Pb thin films is explored by ac susceptibility measurements. For different amplitudes h of the ac drive, the ac susceptibility chi=chi'+ichi" exhibits a complex field dependence associated with different dynamic regimes. At very low ac drives where both multiquanta vortices trapped by the antidots and interstitial vortices oscillate inside the pinning potential (intravalley motion), a small kink in chi'(H) together with a very low dissipation is observed. At intermediate ac excitations such that vortices in the antidots remain pinned, whereas interstices are driven out of the pinning well, a more pronounced kink in the screening coinciding with the onset of dissipation [chi"(H)not equal0] indicates the entrance of interstitial vortices. Eventually, at high enough amplitudes all vortices are set in motion and the penetration of interstitial vortices appears as a sudden reduction of the shielding power. We show that these distinctive features allow us to identify clearly the maximum number of flux quanta per hole, regardless of the vortex dynamic regime.

Disciplines :

Physics

Author, co-author :

Silhanek, Alejandro ; Katholieke Universiteit Leuven - KUL

Raedts, S.

Van Bael, M. J.

Moshchalkov, V. V.

Language :

English

Title :

Experimental determination of the number of flux lines trapped by microholes in superconducting samples

Publication date :

2004

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 :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

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since 14 November 2011

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