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Fine Details Of The Nodal Electronic Excitations In Bi2sr2cacuso8+Delta, T. Valla, T. E. Kidd, J. D. Rameau, H.-J. Noh, G. D. Gu, P. D. Johnson, H.-B. Yang, H. Ding

Faculty Publications

Very high energy resolution photoemission experiments on high quality samples of optimally doped Bi₂Sr₂CaCu₂O_8+δ show new features in the low-energy electronic excitations. A marked change in the binding energy and temperature dependence of the near-nodal scattering rates is observed near the superconducting transition temperature, T_C. The temperature slope of the scattering rate measured at low energy shows a discontinuity at T_C. In the superconducting state, coherent excitations are found with the scattering rates showing a cubic dependence on frequency and temperature. The superconducting gap has a d-wave magnitude …