Pinning, creep and possible melting in the mixed state of NbZr films

Budhani, R. C. ; Suenaga, M. ; Welch, D. O. (1992) Pinning, creep and possible melting in the mixed state of NbZr films Solid State Communications, 81 (2). pp. 179-182. ISSN 0038-1098

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/003810...

Related URL: http://dx.doi.org/10.1016/0038-1098(92)90384-L

Abstract

Current-Voltage (I-V) characteristics and resistivity measurements on NbxZr1-x (x~ 0.15) thin films are reported over a broad range of temperature and magnetic field. In the vicinity of the critical temperature (field) the I-V curves show a transition from the Ohmic to a strongly non-linear behavior on increasing the excitation current density. The linear resistivity is thermally activated with a field dependent barrier height. Although the Ohmic and non-linear data can be described in the framework of the glass model for the mixed state in hard superconductors, it does not yield a universal set of exponents for the glass to fluid transition. The overall response of the mixed state can be understood in the framework of the standard flux-creep theory with inter-vortex interaction.

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