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|Type:||Artigo de periódico|
|Title:||Phonon Self-energy Effects Due To Superconductivity In Bi2sr2cacu2o8+δ|
|Abstract:||Raman scattering of A1g phonons in Bi2Sr2CaCu2O8+δ single crystals (δ=0.13, Tc=86 K) has been measured as a function of temperature. We report an anomalous softening in the frequency and a decrease in the linewidth of the A1g phonon at 290 cm-1 (O1,2 c-axis in-phase vibration) below Tc. We also confirm a smaller anomalous softening in the frequency of the A1g phonon at 465 cm-1 (O3 c-axis vibration), but for this phonon mode no linewidth anomaly has been found. We compare the anomalous softening and linewidth behavior in the superconducting state with theoretical calculations for isotropic s-wave, planar d-wave, and dx 2 -y 2 gap symmetries and as for a layered superconductor model.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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