%A A. P. Durajski %T Anisotropic evolution of energy gap in Bi2212 superconductor %0 Journal Article %D 2016 %J Front. Phys. %J Frontiers of Physics %@ 2095-0462 %R 10.1007/s11467-016-0595-0 %P 117408- %V 11 %N 5 %U {https://journal.hep.com.cn/fop/EN/10.1007/s11467-016-0595-0 %8 2016-10-01 %X

We present a systematic analysis of the energy gap in underdoped Bi2212 superconductor as a function of temperature and hole doping level. Within the framework of the theoretical model containing the electron-phonon and electron-electron-phonon pairing mechanism, we reproduced the measurement results of modern ARPES experiments with very high accuracy. We showed that the energy-gap amplitude is very weakly dependent on the temperature but clearly dependent on the level of doping. The evidence for a non-zero energy gap above the critical temperature, referred to as a pseudogap, was also obtained.