High pressure on novel metal states in hole-doped copper oxides

The intrinsic relationship between pseudoenergy gap and superconductivity is studied by studying the charge, spin, orbit and lattice degrees of freedom of different underdoped copper oxide superconductors and their interactions from the pressure dimension. The proximity effect in the artificial lattice of superconductor and conventional metal is used to realize the singular metal state, which promotes the understanding of pseudoenergy gap behavior and non-Fermi liquid behavior of copper oxide superconductor.