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Effective two-dimensional thickness for the Berezinskii-Kosterlitz-Thouless-like transition in a highly underdoped La2-xSrxCuO4

Title: Effective two-dimensional thickness for the Berezinskii-Kosterlitz-Thouless-like transition in a highly underdoped La2-xSrxCuO4.
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Name(s): Baity, P. G., author
Shi, Xiaoyan, author
Shi, Zhenzhong, author
Benfatto, L., author
Popovic, Dragana, author
Type of Resource: text
Genre: Text
Date Issued: 2016-01-25
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The nature of the superconducting transition in highly underdoped thick films of La2-xSrxCuO4 (x = 0.07 and 0.08) has been investigated using the in-plane transport measurements. The contribution of superconducting fluctuations to the conductivity in zero magnetic field, or paraconductivity, was determined from the magnetoresistance measured in fields applied perpendicular to the CuO2 planes. Both the temperature dependence of the paraconductivity above the transition and the nonlinear current-voltage (I - V) characteristics measured across it exhibit the main signatures of the Berezinskii-Kosterlitz-Thouless (BKT) transition. The quantitative comparison of the superfluid stiffness, extracted from the I - V data, with the renormalization-group results for the BKT theory, reveals a large value of the vortex-core energy. This finding is confirmed by the analysis of the paraconductivity obtained using different methods. The results strongly suggest that the characteristic energy scale controlling the BKT behavior in this layered system corresponds to the superfluid stiffness of a few layers.
Identifier: FSU_libsubv1_wos_000369218500009 (IID), 10.1103/PhysRevB.93.024519 (DOI)
Keywords: critical-behavior, high-temperature superconductors, layered superconductors, monte-carlo calculation, normal-state, phase fluctuations, single-crystals, superconductor-insulator transition, superfluid density, thin-films
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1103/PhysRevB.93.024519
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000369218500009
Owner Institution: FSU
Is Part Of: Physical Review B.
2469-9950
Issue: iss. 2, vol. 93

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Baity, P. G., Shi, X., Shi, Z., Benfatto, L., & Popovic, D. (2016). Effective two-dimensional thickness for the Berezinskii-Kosterlitz-Thouless-like transition in a highly underdoped La2-xSrxCuO4. Physical Review B. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000369218500009