Spin-gapped incoherent metal with preformed pairing in the doped antiferromagnetic Mott insulator

Details Spin-gapped incoherent metal with preformed pairing in the doped antiferromagnetic Mott insulator Spin-gapped incoherent metal with preformed pairing in the doped antiferromagnetic Mott insulator

2007-02-26

arxiv.org/abs/cond-mat/0702586v3

Phys. Rev. B 77, 125103 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.77.125103

We investigate how the antiferromagnetic Mott insulator evolves into the d-wave BCS superconductor through hole doping. Allowing spin fluctuations in the strong coupling approach, we find a spin-gapped incoherent metal with preformed pairing as an intermediate phase between the antiferromagnetic Mott insulator and d-wave superconductor. This non-Fermi liquid metal is identified with an infrared stable fixed point in the spin-decomposition gauge theory, analogous to the spin liquid insulator in the slave-boson gauge theory. We consider the single particle spectrum and dynamical spin susceptibility in the anomalous metallic phase, and discuss physical implications.

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