I-V characteristics of the vortex state in MgB₂ thin films

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Huan Yang,¹ Ying Jia,¹ Lei Shan,¹ Yingzi Zhang,¹ Hai-Hu Wen,¹ Chenggang Zhuang,^2,3 Zikui Liu,⁴ Qi Li,² Yi Cui,² and Xiaoxing Xi^2,4
¹National Laboratory for Superconductivity, Institute of Physics and National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, People's Republic of China
²Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
³Department of Physics, Peking University, Beijing 100871, People's Republic of China
⁴Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

Received 2 April 2007; revised 12 August 2007; published 22 October 2007

Thecurrent-voltage (I-V) characteristics of various MgB₂ films have been studiedat different magnetic fields parallel to the c axis. Atfields µ₀H between 0 and 5 T, vortex liquid-glass transitions werefound in the I-V isotherms. Consistently, the I-V curves measuredat different temperatures show a scaling behavior in the frameworkof quasi-two-dimension (quasi-2D) vortex-glass theory. However, at µ₀H5 T, a finitedissipation was observed down to the lowest temperature here, T=1.7 K,and the I-V isotherms did not scale in terms ofany known scaling law, of any dimensionality. We suggest thatthis may be caused by a mixture of sigma bandvortices and band quasiparticles. Interestingly, the I-V curves atzero magnetic field can still be scaled according to thequasi-2D vortex-glass formalism, indicating an equivalent effect of self-field dueto persistent current and applied magnetic field.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.76.134513
DOI:	10.1103/PhysRevB.76.134513
PACS:	74.70.Ad; 74.25.Qt; 74.25.Sv 74.70.Ad Superconducting metals; alloys and binary compounds (including A15, MgB₂, etc.) 74.25.Qt Vortex lattices, flux pinning, flux creep in superconductors 74.25.Sv Critical currents in superconductors YEAR: 2007
KEYWORDS:	flux flow, magnesium compounds, superconducting thin films, type II superconductors

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