Symmetry dependence of phonon line shapes in superconductors with anisotropic gaps

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.10287· OSTI ID:7167380

Devereaux, T P ^[1]

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1. Department of Physics, University of California, Davis, California 95616 (United States)

The temperature dependence below [ital T][sub [ital c]] of the line shape of optical phonons of different symmetry as seen in Raman scattering is investigated for superconductors with anisotropic energy gaps. It is shown that the symmetry of the electron-phonon vertex produces nontrivial couplings to an anisotropic energy gap which leads to unique changes in the phonon line shape for phonons of different symmetry. The phonon line shape is calculated in detail for [ital B][sub 1[ital g]] and [ital A][sub 1[ital g]] phonons in a superconductor with [ital d][sub [ital x]][sup 2][minus][ital y][sup 2] pairing symmetry. The role of satellites peaks generated by the electron-phonon coupling are also addressed. The theory accounts for the substantial phonon narrowing of the [ital B][sub 1[ital g]] phonon, while narrowing of the [ital A][sub 1[ital g]] phonon which is indistinguishable from the normal state is shown, in agreement with recent measurements on Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub 8] and YBa[sub 2]Cu[sub 3]O[sub 7].

• OSTI ID: 7167380
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:14; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
COPPER COMPOUNDS
CUPRATES
ENERGY GAP
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
SUPERCONDUCTORS
SYMMETRY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS