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.

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

References in corpus (1)

• A `checkerboard' electronic crystal state in lightly hole-doped Ca_{2-x}Na_{x}CuO_{2}Cl_{2}

Cited by in corpus (12)

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• 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
• 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
• 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
• Impurity resonant state in d-wave superconductors: in favor of a Kondo-like response
• Disorder Effects on Competition between Antiferromagnetism and Superconductivity in Cuprate Superconductors through the Enhancement in Charge Susceptibility
• 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