Structural and Tc inhomogeneities inherent to doping in La_{2-x}Sr_xCuO_4 superconductors and their effects on the precursor diamagnetism

Abstract

The inhomogeneities inherent to the random distribution of Sr dopants in La_{2-x}Sr_xCuO_4 superconductors are probed by measuring the x-ray diffraction linewidths and the Meissner transition widths, and then consistently explained on the grounds of a simple model in which the local Sr content is calculated by averaging over distances close to the in-plane electronic mean free path. By taking into account these intrinsic bulk inhomogeneities with long characteristic lengths (much larger than the superconducting coherence length amplitudes), the precursor diamagnetism measured above Tc, a fingerprint of the superconducting transition own nature, is then explained for all doping levels in terms of the conventional Gaussian-Ginzburg-Landau approach for layered superconductors. These results also suggest that the electronic inhomogeneities observed in the normal state by using surface probes overestimate the ones in the bulk.

8 pages (two columns), including 8 figures

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• The diamagnetism above the superconducting transition in underdoped La(1.9)Sr(0.1)CuO(4) revisited: Chemical disorder or phase incoherent superconductivity?
• Comment on 'Diamagnetism and Cooper pairing above Tc in cuprates'
• The conductivity and the magnetization around Tc in optimally-doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ revisited: quantitative analysis in terms of fluctuating superconducting pairs
• Current-current Fermi-liquid corrections to the superconducting fluctuations on conductivity and diamagnetism
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• Comment on "High Field Studies of Superconducting Fluctuations in High-Tc Cuprates. Evidence for a Small Gap distinct from the Large Pseudogap"
• Magnetization vector in the reversible region of a highly anisotropic cuprate superconductor: anisotropy factor and the role of 2D vortex fluctuations
• Angular slippage from the crystallographic c-axis of the reversible magnetization vector in a tilted crystal of a highly anisotropic cuprate superconductor
• Comment on 'Temperature range of superconducting fluctuations above $T_c$ in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals'
• Large increase of the anisotropy factor in the overdoped region of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ as probed by fluctuation spectroscopy
• Calculations of some doping nanostructurations and patterns improving the functionality of high-temperature superconductors for bolometer device applications
• On the dilemma between percolation processes and fluctuating pairs as the origin of the enhanced conductivity above the superconducting transition in cuprates
• New results on the anomalous precursor diamagnetism in the underdoped La1.9Sr0.1CuO4 superconductor
• Empirical case for two pseudogaps in cuprate superconductors
• Precursor superconducting diamagnetism in YBa2Cu3O7-d with in-plane or intercalated magnetic impurities