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

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

2002-06-25

arxiv.org/abs/cond-mat/0206469v2

Phys. Rev. Lett. 91, 027001 (2003).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.91.027001

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.

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