STM/STS Study on 4a×4aElectronic Charge Order of Superconducting Bi2Sr2CaCu2O8+δ
- 15 September 2005
- journal article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 74 (9), 2400-2403
- https://doi.org/10.1143/jpsj.74.2400
Abstract
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 X 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 X 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.Comment: 4 pages, submitted to J. Phys. Soc. JpKeywords
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