Superconducting gap in the presence of bilayer splitting in underdoped (Pb,Bi)(2)Sr2CaCu2O8+delta

Article

关键词: CA-CU-O;    OVERDOPED BI2SR2CACU2O8+DELTA;    CUPRATE SUPERCONDUCTORS;    FERMI-SURFACE;    PHOTOEMISSION;    ANISOTROPY;    SPECTROSCOPY;    SYMMETRY;    PLANE;   

DOI  :  10.1103/PhysRevB.66.140509

来源: SCIE

【 摘 要 】

The clearly resolved bilayer splitting in angle-resolved photoemission spectra of the underdoped Pb-Bi2212 compound raises the question of how the bonding and antibonding sheets of the Fermi surface are gapped in the superconducting state. Here we compare the superconducting gaps for both split components and show that within the experimental uncertainties they are identical. By tuning the relative intensity of the bonding and antibonding bands using different excitation conditions, we determine the precise k dependence of the leading edge gap. Significant deviations from the simple cos(k(x))-cos(k(y)) gap function for the studied doping level are detected.

【 授权许可】

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