Physics – Condensed Matter – Superconductivity
Scientific paper
2009-10-09
Nature Physics vol 6, 99 (2010)
Physics
Condensed Matter
Superconductivity
16 pages, 5 figures
Scientific paper
We use angle resolved photoemission spectroscopy to probe the electronic excitations of the non-superconducting state that exists between the antiferromagnetic Mott insulator at zero doping and the superconducting state at larger dopings in Bi_2Sr_2CaCu_2O_{8+\delta}. We find that this state is a nodal liquid whose excitation gap becomes zero only at points in momentum space. Despite exhibiting a resistivity characteristic of an insulator and the absence of coherent quasiparticle peaks, this material has the same gap structure as the d-wave superconductor. We observe a smooth evolution of the spectrum across the insulator-to-superconductor transition, which suggests that high temperature superconductivity emerges when quantum phase coherence is established in a non-superconducting nodal liquid.
Ai D.
Campuzano Juan-Carlos
Chatterjee Utpal
Claus Harald
Gu Genda
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