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We use angle resolved photoemission spectroscopy to probe the electronicexcitations of the non-superconducting state that exists between theantiferromagnetic Mott insulator at zero doping and the superconducting stateat larger dopings in Bi_2Sr_2CaCu_2O_{8+\delta}. We find that this state is anodal liquid whose excitation gap becomes zero only at points in momentumspace. Despite exhibiting a resistivity characteristic of an insulator and theabsence of coherent quasiparticle peaks, this material has the same gapstructure as the d-wave superconductor. We observe a smooth evolution of thespectrum across the insulator-to-superconductor transition, which suggests thathigh temperature superconductivity emerges when quantum phase coherence isestablished in a non-superconducting nodal liquid.

Observation of a d-wave nodal liquid in highly underdoped Bi_2Sr_2CaCu_2O_{8+\delta}