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14 May 2012

Volume 100, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 100, 203104 (2012); http://dx.doi.org/10.1063/1.3701731 (4 pages)

Z. Y. Jiang, X. X. Jiang, S. Su, X. P. Wei, S. T. Lee, and Y. He
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Controlling flux flow dissipation by changing flux pinning in superconducting films

G. Grimaldi, A. Leo, A. Nigro, A. V. Silhanek, N. Verellen, V. V. Moshchalkov, M. V. Milošević, A. Casaburi, R. Cristiano, and S. Pace

Appl. Phys. Lett. 100, 202601 (2012); http://dx.doi.org/10.1063/1.4718309 (4 pages) | Cited 1 time

Online Publication Date: 14 May 2012

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We study the flux flow state in superconducting materials characterized by rather strong intrinsic pinning, such as Nb, NbN, and nanostructured Al thin films, in which we drag the superconducting dissipative state into the normal state by current biasing. We modify the vortex pinning strength either by ion irradiation, by tuning the measuring temperature or by including artificial pinning centers. We measure critical flux flow voltages for all materials and the same effect is observed: switching to low flux flow dissipations at low fields for an intermediate pinning regime. This mechanism offers a way to additionally promote the stability of the superconducting state.
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81.05.Bx Metals, semimetals, and alloys
81.07.-b Nanoscale materials and structures: fabrication and characterization
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
61.80.Jh Ion radiation effects
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
74.78.Na Mesoscopic and nanoscale systems
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