Superconductivity and the valence state of the Sr site in defective Bi1.8Pb0.2Sr2CuOy

Yan Hongjie; Mao Zhiqiang; Zhang Yuheng

doi:10.1103/PhysRevB.61.15436

Superconductivity and the valence state of the Sr site in defective Bi_1.8Pb_0.2Sr₂CuO_y

Yan Hongjie, Mao Zhiqiang, Zhang Yuheng

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Abstract

The superconductivity and the average valence state of the Sr site are comparatively investigated for the La-doped Bi_1.8Pb_0.2Sr_2-xLa_xCuO_y (0.1≤x≤0.8) system and Sr-vacant Bi_1.8Pb_0.2Sr_2-xCuO_y (0≤x≤0.6) system. Electronic diffraction patterns and Raman spectra show that the incommensuration modulation (IM) is intensified in both systems, but the variation of the IM wavelengths in the La-doped system is much larger than in the Sr-vacant system. Resistivity measurements display that the superconductivity in the La-doped system appears from an overdoped region to underdoped region; however, it is strongly suppressed in the Sr-vacant system. Experimental analysis indicates that such differences between the two systems may arise from the fact that the La doping is pure electron filling, but the Sr vacancy in the Sr site brings about a shift of the apical oxygen of the CuO₆ octahedron and therefore the conductivity of the CuO₂ planes is directly influenced.

Original language	English (US)
Pages (from-to)	15436-15441
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	61
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.61.15436
State	Published - 2000

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.61.15436

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title = "Superconductivity and the valence state of the Sr site in defective Bi1.8Pb0.2Sr2CuOy",

abstract = "The superconductivity and the average valence state of the Sr site are comparatively investigated for the La-doped Bi1.8Pb0.2Sr2-xLaxCuOy (0.1≤x≤0.8) system and Sr-vacant Bi1.8Pb0.2Sr2-xCuOy (0≤x≤0.6) system. Electronic diffraction patterns and Raman spectra show that the incommensuration modulation (IM) is intensified in both systems, but the variation of the IM wavelengths in the La-doped system is much larger than in the Sr-vacant system. Resistivity measurements display that the superconductivity in the La-doped system appears from an overdoped region to underdoped region; however, it is strongly suppressed in the Sr-vacant system. Experimental analysis indicates that such differences between the two systems may arise from the fact that the La doping is pure electron filling, but the Sr vacancy in the Sr site brings about a shift of the apical oxygen of the CuO6 octahedron and therefore the conductivity of the CuO2 planes is directly influenced.",

author = "Yan Hongjie and Mao Zhiqiang and Zhang Yuheng",

year = "2000",

doi = "10.1103/PhysRevB.61.15436",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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publisher = "American Physical Society",

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T1 - Superconductivity and the valence state of the Sr site in defective Bi1.8Pb0.2Sr2CuOy

AU - Hongjie, Yan

AU - Zhiqiang, Mao

AU - Yuheng, Zhang

PY - 2000

Y1 - 2000

N2 - The superconductivity and the average valence state of the Sr site are comparatively investigated for the La-doped Bi1.8Pb0.2Sr2-xLaxCuOy (0.1≤x≤0.8) system and Sr-vacant Bi1.8Pb0.2Sr2-xCuOy (0≤x≤0.6) system. Electronic diffraction patterns and Raman spectra show that the incommensuration modulation (IM) is intensified in both systems, but the variation of the IM wavelengths in the La-doped system is much larger than in the Sr-vacant system. Resistivity measurements display that the superconductivity in the La-doped system appears from an overdoped region to underdoped region; however, it is strongly suppressed in the Sr-vacant system. Experimental analysis indicates that such differences between the two systems may arise from the fact that the La doping is pure electron filling, but the Sr vacancy in the Sr site brings about a shift of the apical oxygen of the CuO6 octahedron and therefore the conductivity of the CuO2 planes is directly influenced.

AB - The superconductivity and the average valence state of the Sr site are comparatively investigated for the La-doped Bi1.8Pb0.2Sr2-xLaxCuOy (0.1≤x≤0.8) system and Sr-vacant Bi1.8Pb0.2Sr2-xCuOy (0≤x≤0.6) system. Electronic diffraction patterns and Raman spectra show that the incommensuration modulation (IM) is intensified in both systems, but the variation of the IM wavelengths in the La-doped system is much larger than in the Sr-vacant system. Resistivity measurements display that the superconductivity in the La-doped system appears from an overdoped region to underdoped region; however, it is strongly suppressed in the Sr-vacant system. Experimental analysis indicates that such differences between the two systems may arise from the fact that the La doping is pure electron filling, but the Sr vacancy in the Sr site brings about a shift of the apical oxygen of the CuO6 octahedron and therefore the conductivity of the CuO2 planes is directly influenced.

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JF - Physical Review B - Condensed Matter and Materials Physics

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Superconductivity and the valence state of the Sr site in defective Bi_1.8Pb_0.2Sr₂CuO_y

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