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Type: Artigo de periódico
Title: Phonon self-energy effects due to superconductivity in Bi2Sr2CaCu2O8+delta
Author: Martin, AA
Sanjurjo, JA
Hewitt, KC
Wang, XZ
Irwin, JC
Lee, MJG
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.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.56.8426
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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