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Scaling of voltage-current characteristics of thin-film Y-Ba-Cu-O at low magnetic fields

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Abstract
  • We have measured voltage-current characteristics for YBa₂Cu₃O₇ thin films in magnetic fields from 5 T to ambient, including some in the millitesla range. In all cases, the resistivity —current density isotherms can be separated into two classes: those which exhibit upward curvature, and have constant resistivity at low currents, and those which exhibit downward curvature at all currents. These two classes of isotherms are separated by a field-dependent temperature T𝓰. For each field, the isotherms scale in a manner consistent with a three-dimensional vortex-liquid to vortex-glass phase transition. The region that can be scaled is several kelvin at 5 T and narrows with decreasing field. The low-current resistivity above T𝓰 varies as l1—T/T𝓰lˢ with s ≈ 7.4 at all fields, but the critical scaling exponents z and v become field dependent below about 10 mT.
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  • Roberts, J. M., Brown, B., Hermann, B. A., & Tate, J. (1994). Scaling of voltage-current characteristics of thin-film Y-Ba-Cu-O at low magnetic fields. Physical Review B, 49(10), 6890-6894. doi:10.1103/PhysRevB.49.6890
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  • 49
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  • 10
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  • The published article can be found at Physical Review B.
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  • J.T. acknowledges the financial support of the Alfred P. Sloan Foundation.
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