STM studies on structural modulation and two-phase microstructures in Pb-doped Bi2201 single crystals

We have performed scanning tunneling microscopy studies on the structural modulation of Bi2.12−xPbxSr1.88CuOy (Pbx-Bi2201, x=0.18, 0.27, 0.32, 0.37) single crystals. The observed STM images show the clear atomic arrangement with the four-fold symmetry on the Bi(Pb)–O layer. The wavelength λ of incom...

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Published inPhysica. C, Superconductivity Vol. 460-462; pp. 156 - 157
Main Authors Nishizaki, Terukazu, Kudo, Kazutaka, Okumura, Naoyuki, Kobayashi, Norio
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2007
Subjects
Pb-doped Bi2201
Phase separation
Scanning tunneling microscopy
Structural modulation
Scanning tunneling microscopy
Pb-doped Bi2201
Structural modulation
Phase separation
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Summary:We have performed scanning tunneling microscopy studies on the structural modulation of Bi2.12−xPbxSr1.88CuOy (Pbx-Bi2201, x=0.18, 0.27, 0.32, 0.37) single crystals. The observed STM images show the clear atomic arrangement with the four-fold symmetry on the Bi(Pb)–O layer. The wavelength λ of incommensurate structural modulations along the b-axis increases with Pb content (i.e., λ∼43Å for x=0.18) and the modulations completely disappear for x∼0.37. In the intermediate content (x∼0.27, 0.32), we find two-phase microstructures which consist of the modulated region with λ∼46Å and the modulation-free region.
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ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2007.04.036