Physics – Condensed Matter
Scientific paper
1993-03-15
Physics
Condensed Matter
13 pages (revtex) + 5 figures (postscript-included), NSF-ITP-93-25
Scientific paper
10.1103/PhysRevB.48.10626
The phase variation of the superconducting gap over the (normal) Fermi surface of the high-temperature superconductors remains a significant unresolved question. Is the phase of the gap constant, does it change sign, or is it perhaps complex? A detailed answer to this question would provide important constraints on various pairing mechanisms. Here we propose a new method for measuring the relative gap PHASE on the Fermi surface which is direct, is angle-resolved, and probes the bulk. The required experiments involve measuring phonon linewidths in the normal and superconducting state, with resolution available in current facilities. We primarily address the La_1.85Sr_.15CuO_4 material, but also propose a more detailed study of a specific phonon in Bi_2Sr_2CaCu_2O_8.
Flatte' Michael E.
Quinlan S.
Scalapino Douglas J.
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