Physics – Condensed Matter
Scientific paper
1993-01-27
Physics
Condensed Matter
7 pages + 1 figure (included), plain tex, NSF-ITP-93-16
Scientific paper
Recent inelastic-neutron-scattering measurements of a low-energy phonon in Bi_2Sr_2CaCu_2O_8 provide enough information to place a lower bound on the energy gap magnitude at precise locations on the Fermi surface. Measurements of a few low-energy phonons should indicate whether the gap symmetry is d_{x^2-y^2}. Further measurements could map out the angle-resolved gap magnitude on the entire Fermi surface.
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