Fermi-surface-free superconductivity in underdoped (Bi,Pb)(Sr,La)2 CuO6+δ (Bi2201)

Abstract

Fermi-surface-free superconductivity arises when the superconducting order pulls down spectral weight from a band that is completely above the Fermi energy in the normal state. We show that this can arise in hole-doped cuprates when a competing order causes a reconstruction of the Fermi surface. The change in Fermi surface topology is accompanied by a characteristic rise in the spectral weight. Our results support the presence of a trisected superconducting dome, and suggest that superconductivity is responsible for stabilizing the (ππ) magnetic order at higher doping.