Fine Details of the Nodal Electronic Excitations in BiSrCaCuO
arXiv:cond-mat/0512685 · doi:10.1103/PhysRevB.73.184518
Abstract
Very high energy resolution photoemission experiments on high quality samples of optimally doped BiSrCaCuO 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, . The temperature slope of the scattering rate measured at low energy shows a discontinuity at ~. 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 with negligible contribution from higher harmonics. Further, the bi-layer splitting has been found to be finite at the nodal point.
arXiv comment5 pages, 4 figures
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