Enhancement of electronic inhomogeneities due to out-of-plane disorder in Bi_2Sr_2CuO_{6+delta} superconductors observed by scanning tunneling spectroscopy

Abstract

Nanoscale electronic inhomogeneity in optimally doped single-layer Bi_2Sr_{1.6}L_{0.4}CuO_{6+delta}, (L-Bi2201, L=La and Gd) as well as bilayer Bi_2Sr_2CaCu_2O_{8+delta} (Bi2212), superconductors has been investigated by the low-temperature scanning-tunneling-microscopy and spectroscopy. The inhomogeneous gap structures are observed above and below Tc on Gd-Bi2201. Increasing the out-of-plane disorder which is controlled by mismatch of the ionic radius between Sr and Ln results in the enhancement of pseudogap region with suppressed coherence peaks in the conductance spectrum, making the gap average larger and the gap distribution wider. The degree of electronic inhomogeneity measured by the distribution width of the gap amplitude is shown to have a correlation with Tc in optimally doped Bi2201 and Bi2212.

arXiv comment5 pages, 4 figures; to be published in Phys. Rev. B

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Cited by in corpus (24)

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• Out of plane effect on the superconductivity of Sr2-xBaxCuO3+y with Tc up to 98K
• C-axis critical current of a PrFeAsO0.7 single crystal
• Effects of out-of-plane disorder on the nodal quasiparticle and superconducting gap in single-layer Bi${}_2$Sr${}_{1.6}L{n}_{0.4}$CuO${}_{6+\delta }$ ($Ln$ = La, Nd, Gd)
• Universal Disorder in Bi2Sr2CaCu2O8+x
• Three energy scales characterizing the competing pseudogap state, the incoherent, and the coherent superconducting state in high-Tc cuprates
• The origin of the anomalously strong influence of out-of-plane disorder on high-Tc superconductivity
• Quasiparticle spectrum of the cuprate BiSrCaCuO: Possible connection to the phase diagram
• Growth and Characterization of Bi${}_{2+x}$Sr${}_{2-x}$CuO${}_{6+\delta }$ Single Crystals
• Superconducting Fluctuation and Pseudogap in Disordered Short Coherence Length Superconductor
• Pair-pair interactions as a mechanism for high-T${}_c$ superconductivity
• Multilayered cuprate superconductor Ba${}_2$Ca${}_5$Cu${}_6$O${}_{12}$(O${}_{1-x}$,F${}_x$)${}_2$ studied by temperature-dependent scanning tunneling microscopy and spectroscopy
• Enhancement of superconducting fluctuation under the coexistence of a competing pseudogap state in Bi2Sr2-xRxCuOy
• The influence of out-of-plane disorder on the formation of pseudogap and Fermi arc in Bi2Sr2-xRxCuOy (R=La and Eu)
• Out-of-plane impurities induced the deviation from the monotonic d-wave superconducting gap in cuprate superconductors
• Quantitative connection between the nanoscale electronic inhomogeneity and the pseudogap of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ superconductors
• Impurity resonant state in d-wave superconductors: in favor of a Kondo-like response
• Theory of Extrinsic and Intrinsic Tunnelling in Cuprate Superconductors
• Compositional Evolution of the Anti-phase Stripe Superstructure in Bi2Sr2-xLaxCuO6 (0<x<=1.1) Revealed by Transmission Electron Microscopy
• Disorder Effects on Competition between Antiferromagnetism and Superconductivity in Cuprate Superconductors through the Enhancement in Charge Susceptibility
• The k-space Origins of Scattering in Bi2Sr2CaCu2O8+x
• Examination of the claim by Loram and Tallon that the energy-resolved STM results, in their apparent inhomogeneity, misrepresent the true bulk behaviour of the HTSC cuprates