Abstract
Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d samples have been investigated under hydrostatic pressure up to 7.2 GPa. Although most observed phonons harden linearly with increasing pressure, the Alg-type Cu mode at 140 cm-1 exhibits a nonlinear hardening with an inflection point around 2 GPa, similar to the dependence of Tc versus pressure. We also find that the mode-specific Grüneisen parameters scale inversely with the corresponding vibrational frequencies, a trend similar to what is observed for molecular solids. The data are interpreted in terms of a nonuniform structural compressibility that results in a redistribution of charge carriers within the Bi2Sr2CaCu2O8+d unit cell.
| Original language | English |
|---|---|
| Pages (from-to) | 8447-8450 |
| Number of pages | 4 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 59 |
| Issue number | 13 |
| Publication status | Published - 1999 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
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Phonon Raman scattering of Bi2Sr2CaCu2O8+d under hydrostatic pressure. / Osada, Minoru; Kakihana, Masato; Arashi, Haruo; Käil, Mikael; Börjesson, Lars.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 59, No. 13, 1999, p. 8447-8450.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Phonon Raman scattering of Bi2Sr2CaCu2O8+d under hydrostatic pressure
AU - Osada, Minoru
AU - Kakihana, Masato
AU - Arashi, Haruo
AU - Käil, Mikael
AU - Börjesson, Lars
PY - 1999
Y1 - 1999
N2 - Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d samples have been investigated under hydrostatic pressure up to 7.2 GPa. Although most observed phonons harden linearly with increasing pressure, the Alg-type Cu mode at 140 cm-1 exhibits a nonlinear hardening with an inflection point around 2 GPa, similar to the dependence of Tc versus pressure. We also find that the mode-specific Grüneisen parameters scale inversely with the corresponding vibrational frequencies, a trend similar to what is observed for molecular solids. The data are interpreted in terms of a nonuniform structural compressibility that results in a redistribution of charge carriers within the Bi2Sr2CaCu2O8+d unit cell.
AB - Phonon Raman scattering from slightly overdoped Bi2Sr2CaCu2O8+d samples have been investigated under hydrostatic pressure up to 7.2 GPa. Although most observed phonons harden linearly with increasing pressure, the Alg-type Cu mode at 140 cm-1 exhibits a nonlinear hardening with an inflection point around 2 GPa, similar to the dependence of Tc versus pressure. We also find that the mode-specific Grüneisen parameters scale inversely with the corresponding vibrational frequencies, a trend similar to what is observed for molecular solids. The data are interpreted in terms of a nonuniform structural compressibility that results in a redistribution of charge carriers within the Bi2Sr2CaCu2O8+d unit cell.
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UR - http://www.scopus.com/inward/citedby.url?scp=0343101413&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0343101413
VL - 59
SP - 8447
EP - 8450
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 13
ER -