STM/STS Study on 4a×4a Electronic Charge Order of Superconducting Bi_2Sr_2CaCu_2O_<8+δ>(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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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<T_c. 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-T_c cuprates.
社団法人日本物理学会の論文
2005-09-15