Nodal metallic behavior of lightly-doped La${}_{2-x}$Sr${}_x$CuO${}_4$

Abstract

Lightly-doped La${}_{2-x}$Sr${}_x$CuO${}_4$ in the so-called "insulating" spin-glass/diagonal-stripe phase has been studied by angle-resolved photoemission spectroscopy. A quasi-particle (QP) peak crossing the Fermi level has been observed in the node direction of the d-wave superconducting gap, forming an "arc" of Fermi surface consistent with the recently observed metallic transport behavior at high temperatures of lightly-doped materials. The spectral weight of the nodal QP smoothly increases with hole doping, corresponding to the $n\sim x$ behavior of the carrier number in the underdoped and lightly-doped regions.

5 pages, 4 figures

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• Distribution of spectral weight in a system with disordered stripes

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