Low-energy electronic state of the structural modulation-free Bi2 Sr2 CuO6 + δ studied by the scanning tunneling microscopy

K. Kudo, T. Nishizaki, N. Okumura, N. Kobayashi

研究成果査読

2 被引用数 (Scopus)

抄録

We report scanning tunneling microscopy (STM) studies on the structural modulation-free Bi2 Sr2 CuO6 + δ in which Bi atoms are partially substituted by Pb atoms. Optimally doped sample with the superconducting transition temperature Tc = 22 K shows short atom-strings at a bias-voltage of 5 mV. Some strings are bundled and aligned along the orthogonal oriented two Cu-O-Cu directions randomly. Atom-strings are also observed in the overdoped sample (Tc = 7 K), while they are hardly seen in the heavily overdoped sample (Tc = 4.5 K). It is found that the disturbance from overdoped holes reduces the number of atom-strings and obscures every atom-string. These results indicate that the CuO2 plane possesses not only the two-dimensional electronic correlation caused by the two-dimensionality but also short-range one-dimensional one.

本文言語English
ページ(範囲)3022-3026
ページ数5
ジャーナルJournal of Physics and Chemistry of Solids
69
12
DOI
出版ステータスPublished - 12月 2008
外部発表はい

ASJC Scopus subject areas

  • 化学一般
  • 材料科学一般
  • 凝縮系物理学

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