Direct visualization of soliton stripes in the CuO2 plane and oxygen interstitials in Bi2(Sr2−xLax)CuO6+δ superconductors

C. Guo; H. F. Tian; H. X. Yang; B. Zhang; K. Sun; X. Sun; Y. Y. Peng; X. J. Zhou; J. Q. Li

doi:10.1103/PhysRevMaterials.1.064802

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Direct visualization of soliton stripes in the CuO2 plane and oxygen interstitials in Bi2(Sr2−xLax)CuO6+δ superconductors

C. Guo, H. F. Tian, H. X. Yang, B. Zhang, K. Sun, X. Sun, Y. Y. Peng, X. J. Zhou, J. Q. Li

DOI 10.1103/PhysRevMaterials.1.064802 · Physical Review Materials

T1

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Abstract

Microstructure features in correlation with the incommensurate modulation and oxygen interstitials in Bi2(Sr2−xLax)CuO6+δ superconducting materials were studied by Cs-corrected scanning transmission electron microscopy. Atomic displacements following the modulation wave were well characterized by a sinusoidal wave for each atomic layer, which highlighted clear changes resulting from increases in the La concentration. Careful investigations of the alterations in the local atomic structure revealed that remarkable microstructural features, i.e., notable soliton lines, which arise from the prominent interplay between incommensurate modulation and the basic lattice, appear at the CuO2 sheets yielding visible structural anomalies for x ranging from 0.40 to 0.85. The interstitial oxygen atoms between the SrO-BiO layers became clearly visible for X≥0.73 and showed well-defined ordered states in the x=1.10 sample. These structural features, in particular the strong structural effects of the soliton lines on the CuO2 sheets, could evidently affect the physical properties of layered La-Bi2201 systems.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2(Sr2-xLax)CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown