Percolative superconductivity in La2CuO4.06 by lattice granularity patterns with scanning micro X-ray absorption near edge structure

Abstract

The simplest cuprate superconductor La2CuO4+y with mobile oxygen interstitials exhibits a clear phase separation, but only recently a bulk multiscale structural phase separation has been observed by using scanning micro X-ray diffraction. Here we get further information on the structural phase separation, using local probe X-ray absorption near edge structure. The spatial distribution of superconducting units is a key parameter controlling percolative superconductivity in complex matter with dispersed superconducting units. These oxides form super-molecular architectures made of superconducting atomic monolayers intercalated by spacers. Oxygen interstitials enter into the rocksalt La2O2+y spacer layers forming oxygen interstitials rich puddles and poor puddles. Their spatial distribution has been determined by using scanning La L3-edge micro X-ray absorption near edge structure. Percolating networks of oxygen rich puddles are observed in different micrometer size portions of the crystals. Moreover, the complex surface resistivity shows two jumps associated to the onset of intra-puddle and inter-puddles percolative superconductivity. The similarity of oxygen doped La2CuO4+y, with the well established phase separation in iron selenide superconductors is also discussed.

9 pages, 6 figures

References in corpus (12)

• Scale-free structural organization of oxygen interstitials in La2CuO4+y
• Resonant and crossover phenomena in a multiband superconductor tuning the chemical potential near a band edge
• Quantum Materials: Shape Resonances in Superstripes
• Optimum inhomogeneity of local lattice distortions in La2CuO4+y
• Inhomogeneous superconductivity and the "pseudogap state of novel superconductors
• A model for the phase separation controlled by doping and the internal chemical pressure in different cuprate superconductors
• Multiscale distribution of oxygen puddles in 1/8 doped YBa2Cu3O6.67
• Scanning micro X-ray diffraction unveils the distribution of oxygen chains nano-puddles in YBa2Cu3O6.33
• Percolation model for the superconductor-insulator transition in granular films
• Atypical BCS-BEC crossover induced by quantum-size effects
• The Misfit Strain Critical Point in the 3D Phase Diagrams of Cuprates
• Disorder effects and current percolation in FeAs based superconductors

Cited by in corpus (17)

• Emergence of superconductivity in the cuprates via a universal percolation process
• Intrinsic arrested nanoscale phase separation near a topological Lifshitz transition in strongly correlated two-band metals
• Percolative nature of the dc paraconductivity in the cuprate superconductors
• Scale-invariant magnetic textures in the strongly correlated oxide NdNiO${}_3$
• Fermi-Bose mixtures and BCS-BEC crossover in high-Tc superconductors
• CDW and similarity of the Mott-Insulator-to-Metal transition in cuprates with the gas to liquid-liquid transition in supercooled water
• Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Superconducting phase diagrams of cuprates and pnictides as a key to the HTSC mechanism
• Functional Nanoscale Phase Separation and Intertwined Order in Quantum Complex Materials
• Intermittent dynamics of antiferromagnetic phase in inhomogeneous iron-based chalcogenide superconductor
• Direct Visualization of Spatial inhomogeneity of Spin Stripes Order in La1.72Sr0.28NiO4
• Changes of statistical structural fluctuations unveils an early compacted degraded stage of PNS myelin
• Scale free distribution of oxygen interstitials wires in optimum doped HgBa${}_2$CuO${}_{4+y}$
• VUV Pump and probe of phase separation and oxygen interstitials in La2NiO4+y using spectromicroscopy
• Manipulating electronic states at oxide interfaces using focused micro X-rays from standard lab-sources
• Gap fluctuations, Cooper pairs with finite center-of-mass momentum, and suppression of superconductivity in inhomogeneous systems with dopant superpuddles agglomerates