Irreversibility of the threshold field for dendritic flux avalanches in superconductors |
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| Authors: | A.J. Qviller,V.V. Yurchenko,K. Eliassen,J.I. Vestgå rden,T.H. Johansen,M.R. Nevala,I.J. Maasilta,K. Senapati,R.C. Budhani |
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| Affiliation: | 1. Department of Physics and Center for Materials Science and Nanotechnology, University of Oslo, P.O. Box 1048, Blindern, 0316 Oslo, Norway;2. Nanoscience Center, Department of Physics, University of Jyvaskyla, P.O. Box 35, FIN 40014, Finland;3. Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208 016, India |
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| Abstract: | Hysteretic effects are seen in the upper and lower threshold fields for the appearance of dendritic flux instabilities, first explained in Yurchenko et al. [Phys. Rev. B 76 (2007) 092504], in NbN-films. We have measured the threshold fields at increasing and decreasing applied fields at different temperatures and proposed a mechanism explaining how the hysteresis arises by analyzing the field profiles inside the sample. |
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| Keywords: | Thermomagnetic instability Flux avalanches |
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