Non-Ohmic Electrical Transport in the Vicinity of the Superconducting Transition: Implications for the Study of the Phase Diagram of the Underdoped Cuprate Superconductors

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• 作者：M. V. Ramallo ; J. C. Verde ; N. Cotón…
• 关键词：Fluctuation phenomena in superconductors ; Superconductivity phase diagrams ; Effects of crystal defects ; doping and substitution in high temperature superconductors ; Nonlinear electrical resistance in two ; dimensional superconductors
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：28
• 期：2
• 页码：323-326
• 全文大小：221 KB
• 参考文献：1. Vidal, F., Ramallo, M.V.: Multilayering effects on the thermal fluctuations of Cooper pairs around the superconducting transition in cuprates. In: Bok, J., Deutscher, G., Pavuna, D., Wolf, S.A (eds.) The Gap Symmetry and Fluctuations in High Temperature Superconductors, pp 477-98. Plenum, London (1998)
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  5. Li, L., et al.: Diamagnetism and Cooper pairing above / T _c in cuprates. Phys. Rev. B 81, 054510 (2010) CrossRef
  6. Xu, Z.A., et al.: Vortex-like excitations and the onset of superconducting phase fluctuation in underdoped La _{2?em class="a-plus-plus">x} Sr _{/ x} CuO ₄. Nature 406, 486-88 (2000) CrossRef
  7. Mosqueira, J., Dancausa, J.D., Vidal, F.: Diamagnetism above the superconducting transition in underdoped La _1.9Sr _0.1CuO ₄: Chemical disorder versus phase incoherent superconductivity. Phys. Rev. B 84, 174518 (2011) CrossRef
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  10. Cotón, N., Ramallo, M. V., Vidal, F.: Effects of critical temperature inhomogeneities on the voltage-current characteristics of a planar superconductor near the Berezinskii-Kosterlitz-Thouless transition. Supercond. Sci. Technol. 24, 085013 (2011) CrossRef
  11. Cotón, N., et al.: Finite-element and effective-medium calculations of the electrical behaviour near the vortex-antivortex binding transition of planar superconductors with critical temperature inhomogeneities. J. Supercond. Nov. Mag. 26, 3065-068 (2013) CrossRef
  12. Cotón, N., Ramallo, M.V., Vidal, F.: Critical temperatures for superconducting phase-coherence and condensation in La _2?xSr _xCuO ₄. ArXiv:1309.5910 (2013)
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  15. Puica, I., Lang, W.: Critical fluctuation conductivity in layered superco
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

In this paper, we present a theoretical discussion of the non-ohmic regime of the electrical conductivity of a type-II planar superconductor near its superconducting transition, focusing mainly in the region between the phase-coherence and the pair-condensation critical temperatures, T phase T T cond. For that purpose, we extend down to those temperatures existing calculations for the so-called Aslamazov-Larkin conductivity in presence of finite electric fields, and the resulting exponent α of the fluctuation voltage-current characteristics E?em class="a-plus-plus">j α . These results are then discussed by considering two possible scenarios for the phase diagram of the superconducting fluctuations in the underdoped high-temperature superconductors. Our results suggest that the strong phase fluctuations scenario (i.e., large T cond?em class="a-plus-plus">T phase) leads to a plateau in the T-dependence of the exponent α near T phase, and that the T-region over which this plateau extends becomes wider when the applied electric field is increased. These features are much smaller in the conventional fluctuations scenario (i.e., small T cond?em class="a-plus-plus">T phase).