Non-linear flux flow resistance of type-II superconducting films

Grimaldi, G., Leo, A., Cirillo, C., Casaburi, A. , Cristiano, R., Attanasio, C., Nigro, A., Pace, S. and Huebener, R.P. (2011) Non-linear flux flow resistance of type-II superconducting films. Journal of Superconductivity and Novel Magnetism, 24(1-2), pp. 81-87. (doi:10.1007/S10948-010-0902-X)

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Abstract

We analyze the flux-flow (FF) regime in type-II superconducting films exhibiting quite strong pinning. By driving the vortex lattice (VL) up to high dissipative states, the moving VL undergoes an instability, leading to an abrupt change from the FF to the normal state, which is displayed in the current-voltage characteristics as a voltage jump at a critical vortex velocity v ∗. The temperature and magnetic field dependence of v ∗ is investigated in different materials, and an unpredicted low field behavior of v ∗(B) is found. Moreover, for velocities lower than v ∗, a non-linear FF resistance is observed, with a “peak” in the current dependence of the dynamic resistance. This is a remarkable feature of a dynamic transition from disordered to ordered VL occurring in the FF state. We suggest that both unusual effects observed in v ∗(B) and R FF(I) can be accounted for intrinsic pinning.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Casaburi, Dr Alessandro
Authors: Grimaldi, G., Leo, A., Cirillo, C., Casaburi, A., Cristiano, R., Attanasio, C., Nigro, A., Pace, S., and Huebener, R.P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Superconductivity and Novel Magnetism
ISSN:1557-1939
ISSN (Online):1557-1947
Published Online:02 October 2010

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