On the relations among the pseudogap, electronic charge order and Fermi-arc superconductivity in Bi2Sr2CaCu2O8+δ

On the basis of STM/STS, break-junction tunneling and electronic Raman scattering experiments on Bi2Sr2CaCu2O8+δ reported so far, we suggest that the static, electronic charge order is associated with inhomogeneous electronic states on antinodal parts of the Fermi surface that are outside the Fermi-arc around the node and responsible for the pseudogap, and coexists with the homogeneous superconductivity caused by the pairing of coherent quasiparticles on the Fermi-arc, the so-called 'Fermi-arc superconductivity', in the real space, although the two electronic orders or the corresponding energy gaps compete with each other in the k-space.