Inelastic light scattering from collective modes in a layered superconductor with Cooper-pair tunneling

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.7742· OSTI ID:115877

Wu, W ^[1]; Griffin, A ^[2]

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1. Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7 (Canada)
2. Dipartimento di Fisica, Universita di Trento, I-38050 Povo (Italy)

In a superconducting bilayer with Cooper-pair tunneling ({ital T}{sub {ital J}}{ne}0) between the layers, it has been recently predicted that there should exist in-phase and out-of-phase phase and amplitude fluctuations of the order parameters of the two layers. As a way of observing these phase modes, we calculate the inelastic light scattering from a semi-infinite superconducting superlattice with a bilayer basis. For simplicity, we ignore surface modes. We show that the bulk phase-modes show up as resonances in the isotropic Raman light scattering intensity at finite momentum transfer parallel to the surface. Our specific calculations are for {ital s}-wave superconductors but similar results are expected for {ital d}-wave pairing. The size of the energy gap of the out-of-phase modes is strongly dependent on the ratio of {ital T}{sub {ital J}} and the intralayer pairing interaction {ital g}, as well as particle-hole damping.

• OSTI ID: 115877
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COLLECTIVE EXCITATIONS
COOPER PAIRS
D WAVES
ENERGY GAP
INELASTIC SCATTERING
LAYERS
LIGHT SCATTERING
ORDER PARAMETERS
PAIRING INTERACTIONS
S WAVES
SUPERCONDUCTORS
TUNNEL EFFECT