Raman scattering on superconducting crystals of Bi2(Sr1−xCax)n+2Cun+10(6+2n)+δ (n = 0, 1)

Cardona, M.; Thomsen, C.; Liu, R.; Schnering, Hans Georg̀ von; Hartweg, M.; Yan, Yongsheng; Zhao, Zhongxian

doi:10.1016/0038-1098(88)90041-5

Cited by 123 publications

(39 citation statements)

References 15 publications

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“…It has been generally found that a larger number of phonon modes occur in the Raman spectra of the Bi-based compounds than would [9,45,47]. However, recently it was argued that the assignment should be reversed [48,49].…”

Section: Theoretical Calculations a Shell Model Approximation Andmentioning

confidence: 99%

c-axis lattice dynamics in Bi-based cuprate superconductors

et al. 2004

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We present results of a systematic study of the c axis lattice dynamics in single layer Bi 2 Sr 2 CuO 6 (Bi2201), bilayer Bi 2 Sr 2 CaCu 2 O 8 (Bi2212) and trilayer Bi 2 Sr 2 Ca 2 Cu 3 O 10 (Bi2223) cuprate superconductors. Our study is based on both experimental data obtained by spectral ellipsometry on single crystals and theoretical calculations. The calculations are carried out within the framework of a classical shell model, which includes long-range Coulomb interactions and short-range interactions of the Buckingham form in a system of polarizable ions. Using the same set of the shell model parameters for Bi2201, Bi2212 and Bi2223, we calculate the frequencies of the Brillouin-zone center phonon modes of A 2u symmetry and suggest the phonon mode eigenvector patterns. We achieve good agreement between the calculated A 2u eigenfrequencies and the experimental values of the c axis TO phonon frequencies which allows us to make a reliable phonon mode assignment for all three Bi-based cuprate superconductors. We also present the results of our shell model calculations for the Γ-point A 1g symmetry modes in Bi2201, Bi2212 and Bi2223 and suggest an assignment that is based on the published experimental Raman spectra. The superconductivity-induced phonon anomalies recently observed in the c axis infrared and resonant Raman scattering spectra in trilayer Bi2223 are consistently explained with the suggested assignment.

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Section: Theoretical Calculations a Shell Model Approximation Andmentioning

confidence: 99%

c-axis lattice dynamics in Bi-based cuprate superconductors

et al. 2004

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“…Following Yoshizaki et al 16 and Prade et al,2 the 318 cm~1 band may be assigned to the BiÈO(2), O(3) stretching vibrations. The band at 285 cm~1 may be identiÐed with the out-of-phase angle bending mode of oxygen in CuÈO layers as report-B 1g ed by Cardona et al 9 The peaks observed at 465 and 645 cm~1 are noteworthy. A comparison with the data on helped us to assign the band at 465 YBa 2 Cu 3 O 7~d 15 cm~1 to the CuÈO longitudinal stretching mode.…”

Section: Resultsmentioning

confidence: 72%

Micro-Raman study of polycrystalline Bi2Sr2Ca1-xErxCu2O8+δ (0.0x1.0) composition

Sattar¹,

Srivastava²,

Sharma³

et al. 1997

J. Raman Spectrosc.

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“…6,10,16 The average valence state in the Sr site is changed by La doping and Sr vacancy in both systems, the integrated Sr-O bond in the SrO 2 layers would be affected, and a distortion of the Sr-O bond would inevitably take place. Therefore, the appearance of peaks around 303 cm Ϫ1 in Raman spectra directly reflects the distortion of the microstructure induced by the La doping and Sr vacancy in the SrO 2 layers.…”

Section: Resultsmentioning

confidence: 99%

“…Different layers in the crystal structures possess different contribution to the high-T c superconductivity: 9 the CuO 2 planes are conductive layers which are believed to mainly dominate the superconductivity and the normal-state transport properties, the double Bi 2 O 2 layers in Bi-based systems from the Bi-concentrated band which is commonly considered to be the origin of the incommensurate modulation. 7,10 In the Bi2201 phase the SrO 2 layers are located between the upper Bi 2 O 2 layers and the lower CuO 2 planes and directly coupled with the upper and lower layers. Simultaneously, the oxygen atom in the SrO 2 layer is just the apical oxygen of the CuO 6 octahedron.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and the valence state of the Sr site in defectiveBi1.8Pb0.2Sr<

2000

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The superconductivity and the average valence state of the Sr site are comparatively investigated for the La-doped Bi 1.8 Pb 0.2 Sr 2Ϫx La x CuO y (0.1рxр0.8) system and Sr-vacant Bi 1.8 Pb 0.2 Sr 2Ϫx CuO y (0рxр0.6) system. Electronic diffraction patterns and Raman spectra show that the incommensuration modulation ͑IM͒ 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 CuO 6 octahedron and therefore the conductivity of the CuO 2 planes is directly influenced.

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Raman scattering on superconducting crystals of Bi2(Sr1−xCax)n+2Cun+10(6+2n)+δ (n = 0, 1)

Cited by 123 publications

References 15 publications

c-axis lattice dynamics in Bi-based cuprate superconductors

c-axis lattice dynamics in Bi-based cuprate superconductors

Micro-Raman study of polycrystalline Bi2Sr2Ca1-xErxCu2O8+δ (0.0x1.0) composition

Superconductivity and the valence state of the Sr site in defectiveBi1.8Pb0.2Sr<

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