Striped superconductors in the extended Hubbard model

Details Striped superconductors in the extended Hubbard model Striped superconductors in the extended Hubbard model

2000-03-17

arxiv.org/abs/cond-mat/0003316v3

Europhys. Lett., v. 56, 849 (2001)

Physics

Condensed Matter

Superconductivity

5 pages, 3 eps figures. Effect of t' on stripe filling + new references are added

Scientific paper

We present a minimal model of a doped Mott insulator that simultaneously supports antiferromagnetic stripes and d-wave superconductivity. We explore the implications for the global phase diagram of the superconducting cuprates. At the unrestricted mean-field level, the various phases of the cuprates, including weak and strong pseudogap phases, and two different types of superconductivity in the underdoped and the overdoped regimes, find a natural interpretation. We argue that on the underdoped side, the superconductor is intrinsically inhomogeneous -- striped coexistence of of superconductivity and magnetism -- and global phase coherence is achieved through Josephson-like coupling of the superconducting stripes. On the overdoped side, the state is overall homogeneous and the superconductivity is of the classical BCS type.

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