Nodal metallic behavior of lightly-doped La2-xSrxCuO4
Abstract
Lightly-doped La2-xSrxCuO4 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 x behavior of the carrier number in the underdoped and lightly-doped regions.
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