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|Type:||Artigo de periódico|
|Title:||Phonon self-energy effects due to superconductivity in Bi2Sr2CaCu2O8+delta|
|Abstract:||Raman scattering of A(1g) phonons in Bi2Sr2CaCu2O8+delta single crystals (delta = 0.13, T-c = 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 A(1g) phonon at 290 cm(-1) (O-1,O-2 c-axis in-phase vibration) below T-c. We also confirm a smaller anomalous softening in the frequency of the A,, phonon at 465 cm(-1) (O-3 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 d(x2-y2) gap symmetries and as for a layered superconductor model.|
|Editor:||American Physical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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