Lower Bound on the Energy Gap at Precise Locations on the Bi2Sr2CaCu2O8 Fermi Surface
Abstract
Recent inelastic-neutron-scattering measurements of a low-energy phonon in Bi2Sr2CaCu2O8 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 dx2-y2. Further measurements could map out the angle-resolved gap magnitude on the entire Fermi surface.
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