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Osada, Minoru; Kakihana, Masato; Käll, Mikael; Börjesson, Lars; Inoue, Atsuyoshi; Yashima, Masatomo

doi:10.1103/physrevb.56.2847

Cited by 27 publications

(11 citation statements)

References 29 publications

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“…The two modes centered at 560 and 650 cm À1 at normal pressure are attributed to the Sr-O bond. A mode with a similar frequency was also observed in multicomponent superconductors of Bi 2 Sr 2Àx La x CuO 6+d [22,23] and BiPbSrCuO [24]. With increase of pressure, the mode centered at 650 cm À1 with a strong intensity at normal pressure loses its intensity gradually and a new mode around 570 cm À1 starts to appear when the pressure is increased to 1.4 GPa.…”

Section: Resultssupporting

confidence: 51%

“…As far as we know, this is the first report on the Raman spectrum of Bi 2 Sr 2 O 5 and it is not easy to make a quantitative assignment for these observed modes. However, from the analysis of the previous experimental observations in a-Bi 2 O 3 [16,21] and other Bicontained oxides [22][23][24], we believe that the modes with shift below 400 cm À1 are related to the Bi-O bonds in the compound. The two modes centered at 560 and 650 cm À1 at normal pressure are attributed to the Sr-O bond.…”

Section: Resultsmentioning

confidence: 95%

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Structural behavior of Sr2Bi2O5 at high pressures

Zhang

Manoun

Saxena

et al. 2006

Journal of Solid State Chemistry

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Section: Resultssupporting

confidence: 51%

Section: Resultsmentioning

confidence: 95%

Structural behavior of Sr2Bi2O5 at high pressures

Zhang

Manoun

Saxena

et al. 2006

Journal of Solid State Chemistry

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“…17 Extensive studies, along with the efforts to assign the main oxygen modes in these compounds were also performed using Raman scattering. [18][19][20][21][22][23][24][25][26][27][28][29] In this paper we present a systematic study of the c-axis IR phonons in Bi and Tl cuprates by means of grazing angle reflectivity measurements. We discuss the technique used and show its sensitivity to the c-axis properties in anisotropic materials.…”

Section: Introductionmentioning

confidence: 99%

Systematics ofc-axis phonons in the thallium- and bismuth-based cuprate superconductors

et al. 1999

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We present grazing incidence reflectivity measurements in the far infrared region at temperatures above and below Tc for a series of thallium (Tl2Ba2CuO6, Tl2Ba2CaCu2O8) and bismuth (Bi2Sr2CuO6, Bi2Sr2CaCu2O8, and Bi2−xPbxSr2CaCu2O8) based cuprate superconductors. From the spectra, which are dominated by the c-axis phonons, longitudinal frequencies (LO) are directly obtained. The reflectivity curves are well fitted by a series of Lorentz oscillators. In this way the transverse (TO) phonon frequencies were accurately determined. On the basis of the comparative study of the Bi and Tl based cuprates with different number of CuO2 layers per unit cell, we suggest modifications of the assignment of the main oxygen modes. We compare the LO frequencies in Bi2Sr2CaCu2O8 and Tl2Ba2Ca2Cu3O10 obtained from intrinsic Josephson junction characteristics with our measurements, and explain the discrepancy in LO frequencies obtained by the two different methods.

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“…It can be observed that the resistivity shows a systematic change with decreasing Sr content. The superconductive transition temperature T c is 15 …”

Section: Resultsmentioning

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-active phonons inBi2Sr2−xLa

Cited by 27 publications

References 29 publications

Structural behavior of Sr2Bi2O5 at high pressures

Structural behavior of Sr2Bi2O5 at high pressures

Systematics ofc-axis phonons in the thallium- and bismuth-based cuprate superconductors

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

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