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Current-Voltage Characteristics and Vortex Dynamics in Highly Underdoped La2−x Sr x CuO4

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Abstract

The temperature dependence of the nonlinear current-voltage (I–V) characteristics in highly underdoped La2−x Sr x CuO4 (x = 0.07 and 0.08) thick films has been studied in both zero and perpendicular magnetic fields H. Power-law behavior of V(I) is found for both H = 0 and H ≠ 0. The critical current I c was extracted, and its temperature and magnetic field dependences were studied in detail. The Berezinskii-Kosterlitz-Thouless physics dominates the nonlinear I–V near the superconducting transition at H = 0, and it continues to contribute up to a characteristic temperature T x (H). Nonlinear I–V persists up to an even higher temperature T h (H) due to the depinning of vortices.

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Acknowledgments

We thank A. T. Bollinger and I. Božović for the samples. We acknowledge L. Benfatto for useful discussions. This work was partially supported by NSF Grant No. DMR-1307075 and by the NHMFL, which is supported by NSF/DMR-1157490 and the State of Florida.

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Authors and Affiliations

  1. National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, FL, 32310, USA

    Zhenzhong Shi, P. G. Baity & Dragana Popović

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  1. Zhenzhong Shi
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  2. P. G. Baity
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  3. Dragana Popović
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Correspondence to Dragana Popović.

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Shi, Z., Baity, P.G. & Popović, D. Current-Voltage Characteristics and Vortex Dynamics in Highly Underdoped La2−x Sr x CuO4 . J Supercond Nov Magn 29, 651–654 (2016). https://doi.org/10.1007/s10948-015-3301-5

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