paper

Spin correlations in the algebraic spin liquid - implications for high Tc superconductors

arXiv:cond-mat/0201521 · doi:10.1103/PhysRevB.66.144501

Abstract

We propose that underdoped high superconductors are described by an algebraic spin liquid (ASL) at high energies, which undergoes a spin-charge recombination transition at low energies. The spin correlation in the ASL is calculated via its effective theory - a system of massless Dirac fermions coupled to a U(1) gauge field. We find that without fine tuning any parameters the gauge interaction strongly enhances the staggered spin correlation even in the presence of a large single particle pseudo-gap. This allows us to show that the ASL plus spin-charge recombination picture can explain many highly unusual properties of underdoped high superconductors.

22 pages, 18 figures, submitted to PRB

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