New mean-field theory of the tt't''J model applied to high-T(c) superconductors.
We introduce a new mean-field approach to the tt't''J model that incorporates both electron-like quasiparticle and spinon excitations as suggested by some experiments and numerical studies. It leads to a mean-field phase diagram which is consistent with that of hole and electron doped cuprates. Moreover, it provides a framework to describe the observed evolution of the electron spectral function from the undoped insulator to the overdoped Fermi metal for both hole and electron doping. The theory also provides a new non-BCS mechanism leading to superconductivity.
Ribeiro
Tiago C
TC
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Wen
Xiao-Gang
XG