The in-plane paraconductivity in La_{2-x}Sr_xCuO_4 thin film superconductors at high reduced-temperatures: Independence of the normal-state pseudogap

Abstract

The in-plane resistivity has been measured in $L{a}_{2-x}S{r}_{x}Cu{O}_4$ (LSxCO) superconducting thin films of underdoped ($x=0.10,0.12$), optimally-doped ($x=0.15$) and overdoped ($x=0.20,0.25$) compositions. These films were grown on (100)SrTiO${}_3$ substrates, and have about 150 nm thickness. The in-plane conductivity induced by superconducting fluctuations above the superconducting transition (the so-called in-plane paraconductivity, $\Delta {\sigma }_{ab}$) was extracted from these data in the reduced-temperature range $10^{-2}\lsimε\equiv\ln(T/\Tc)\lsim1$. Such a $\Delta {\sigma }_{ab}(\epsilon )$ was then analyzed in terms of the mean-field--like Gaussian-Ginzburg-Landau (GGL) approach extended to the high-$\epsilon$ region by means of the introduction of a total-energy cutoff, which takes into account both the kinetic energy and the quantum localization energy of each fluctuating mode. Our results strongly suggest that at all temperatures above Tc, including the high reduced-temperature region, the doping mainly affects in LSxCO thin films the normal-state properties and that its influence on the superconducting fluctuations is relatively moderate: Even in the high-$\epsilon$ region, the in-plane paraconductivity is found to be independent of the opening of a pseudogap in the normal state of the underdoped films.

arXiv comment35 pages including 10 figures and 1 table

References in corpus (9)

• The pseudogap in high-temperature superconductors: an experimental survey
• On the superconductivity in the system with preformed pairs
• Phase Fluctuations and Pseudogap Phenomena
• Microscopic theory of weak pseudogap behavior in the underdoped cuprate superconductors I: General theory and quasiparticle properties
• Evidence for a generic novel quantum transition in high-Tc cuprates
• Conductivity of underdoped YBa2Cu3O7-d : evidence for incoherent pair correlations in the pseudogap regime
• Phase fluctuations and the pseudogap in YBa2Cu3Ox
• On the consequences of the uncertainty principle on the superconducting fluctuations well inside the normal state
• Superconducting fluctuations and anomalous diamagnetism in underdoped YBa2Cu3O6+x from magnetization and 63Cu NMR-NQR relaxation measurements

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• Reply to Comment on "High-field studies of superconducting fluctuations in high-Tc cuprates: Evidence for a small gap distinct from the large pseudogap" by M.V. Ramallo et al
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