STM/STS Study on 4a×4a Electronic Charge Order of Superconducting Bi2Sr2CaCu2O8+δ

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  • STM/STS Study on 4a*4a Electronic Charge Order of Superconducting Bi2Sr2CaCu2O8+.DELTA.
  • STM STS Study on 4a 4a Electronic Charge Order of Superconducting Bi2Sr2CaCu2O8 デルタ
  • STM/STS Study on 4<i>a</i>×4<i>a</i>Electronic Charge Order of Superconducting Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub>

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We performed low-bias STM measurements on underdoped Bi2212 crystals, and confirmed that a two-dimensional (2D) superstructure with a periodicity of four lattice constants (4a) is formed within the Cu–O plane at T<Tc. This 4a×4a superstructure, oriented along the Cu–O bonding direction, is nondispersive and more intense in lightly doped samples with a zero temperature pseudogap (ZTPG) than in samples with a d-wave gap. The nondispersive 4a×4a superstructure was clearly observed within the ZTPG or d-wave gap, while it tended to fade out outside the gaps. The present results provide a useful test for various models proposed for an electronic order hidden in the underdoped region of high-Tc cuprates.

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