High-pressure Raman study of Bi2Sr2CaCu2O8+d: indications of strong bond-strength hierarchy and pressure-induced charge transfer

M. Osada; M. Kakihana; T. Asai; H. Arashi; M. Käll; L. Börjesson

doi:10.1016/S0921-4534(00)01067-4

High-pressure Raman study of Bi₂Sr₂CaCu₂O_8+d: indications of strong bond-strength hierarchy and pressure-induced charge transfer

M. Osada, M. Kakihana, T. Asai, H. Arashi, M. Käll, L. Börjesson

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

Phonon Raman scattering from slightly overdoped Bi₂Sr₂CaCu₂O_8+d (Bi2212) samples have been investigated under hydrostatic pressure up to 7.2 GPa. The mode-specific Gruneisen parameters scale inversely with the corresponding phonon frequencies, the behavior of which is reminiscent of phonon pressure dependences in molecular solids. We also find that the 140 cm^-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of T_c versus pressure. The data are interpreted in terms of a non-uniform structural compressibility that results in a redistribution of charge carriers within the Bi2212 unit-cell.

Original language	English
Pages (from-to)	2241-2242
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	341-348 (IV)
DOIs	https://doi.org/10.1016/S0921-4534(00)01067-4
Publication status	Published - 2000 Nov
Externally published	Yes
Event	International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA Duration: 2000 Feb 20 → 2000 Feb 25

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(00)01067-4

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High-pressure Raman study of Bi₂Sr₂CaCu₂O_8+d : indications of strong bond-strength hierarchy and pressure-induced charge transfer. / Osada, M.; Kakihana, M.; Asai, T.; Arashi, H.; Käll, M.; Börjesson, L.

In: Physica C: Superconductivity and its applications, Vol. 341-348 (IV), 11.2000, p. 2241-2242.

Research output: Contribution to journal › Conference article › peer-review

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abstract = "Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d (Bi2212) samples have been investigated under hydrostatic pressure up to 7.2 GPa. The mode-specific Gruneisen parameters scale inversely with the corresponding phonon frequencies, the behavior of which is reminiscent of phonon pressure dependences in molecular solids. We also find that the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. The data are interpreted in terms of a non-uniform structural compressibility that results in a redistribution of charge carriers within the Bi2212 unit-cell.",

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T2 - International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI

AU - Osada, M.

AU - Kakihana, M.

AU - Asai, T.

AU - Arashi, H.

AU - Käll, M.

AU - Börjesson, L.

PY - 2000/11

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N2 - Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d (Bi2212) samples have been investigated under hydrostatic pressure up to 7.2 GPa. The mode-specific Gruneisen parameters scale inversely with the corresponding phonon frequencies, the behavior of which is reminiscent of phonon pressure dependences in molecular solids. We also find that the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. The data are interpreted in terms of a non-uniform structural compressibility that results in a redistribution of charge carriers within the Bi2212 unit-cell.

AB - Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d (Bi2212) samples have been investigated under hydrostatic pressure up to 7.2 GPa. The mode-specific Gruneisen parameters scale inversely with the corresponding phonon frequencies, the behavior of which is reminiscent of phonon pressure dependences in molecular solids. We also find that the 140 cm-1 Cu mode exhibits a pronounced nonlinear pressure dependence which correlates to the dependence of Tc versus pressure. The data are interpreted in terms of a non-uniform structural compressibility that results in a redistribution of charge carriers within the Bi2212 unit-cell.

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High-pressure Raman study of Bi₂Sr₂CaCu₂O_8+d: indications of strong bond-strength hierarchy and pressure-induced charge transfer

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