Phonon self-energy effects due to superconductivity in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.8426· OSTI ID:632625

Martin, A A; Sanjurjo, J A ^[1]; Hewitt, K C; Wang, X; Irwin, J C ^[2]; Lee, M J ^[3]

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1. Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, 13083-970 Campinas, Sao Paulo (Brazil)
2. Simon Fraser University, Department of Physics, British Columbia, V5A 1S6 (CANADA)
3. Department of Physics and Scarborough College, University of Toronto, Toronto, Ontario, M5S 1A7 (CANADA)

Raman scattering of A{sub 1g} phonons in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystals ({delta}=0.13, T{sub c}=86thinspK) 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{sub 1g} phonon at 290thinspcm{sup {minus}1} (O{sub 1,2} c-axis in-phase vibration) below T{sub c}. We also confirm a smaller anomalous softening in the frequency of the A{sub 1g} phonon at 465thinspcm{sup {minus}1} (O{sub 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{sub x{sup 2}{minus}y{sup 2}} gap symmetries and as for a layered superconductor model. thinsp {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 632625
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
LINE WIDTHS
PHONONS
RAMAN EFFECT
RAMAN SPECTRA
STRONTIUM OXIDES
SUPERCONDUCTIVITY