Low energy excitation and scaling in Bi2Sr2Can-1CunO2n+4 (n=1-3):: Angle-resolved photoemission spectroscopy -: art. no. 067005

Angle-resolved photoemission spectroscopy (ARPES) has been performed on the single- to triple-layered Bi-family high-T (c) superconductors (Bi2Sr2Can-1CunO2n+4, n=1-3). We found a sharp coherent peak as well as a pseudogap at the Fermi level in the triple-layered compound. Comparison among three compounds has revealed a universal rule that the characteristic energies of superconducting and pseudogap behaviors are scaled with the maximum T-c.