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

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3022-3026
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Issue number12
Publication statusPublished - Dec 2008
Externally publishedYes


  • A. Superconductors
  • C. Scanning tunneling microscopy
  • D. Charge-density waves

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


Dive into the research topics of 'Low-energy electronic state of the structural modulation-free Bi<sub>2</sub> Sr<sub>2</sub> CuO<sub>6 + δ</sub> studied by the scanning tunneling microscopy'. Together they form a unique fingerprint.

Cite this