Universal versus Material-Dependent Two-Gap Behaviors in the High-Tc Cuprates: Angle-Resolved Photoemission Study of La2-xSrxCuO4

Abstract

We have investigated the doping and temperature dependences of the pseudogap/superconducting gap in the single-layer cuprate La${}_{2-x}$Sr${}_x$CuO${}_4$ by angle-resolved photoemission spectroscopy. The results clearly exhibit two distinct energy and temperature scales, namely, the gap around ($\pi$,0) of magnitude ${\Delta }^{\ast }$ and the gap around the node characterized by the d-wave order parameter ${\Delta }_0$, like the double-layer cuprate Bi2212. In comparison with Bi2212 having higher $T_c$'s, ${\Delta }_0$ is smaller, while ${\Delta }^{\ast }$ and $T^{\ast }$ are similar. This result suggests that ${\Delta }^{\ast }$ and $T^{\ast }$ are approximately material-independent properties of a single CuO${}_2$ plane, in contrast the material-dependent ${\Delta }_0$, representing the pairing strength.

5 pages, 4 figures

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• The influence of out-of-plane disorder on the formation of pseudogap and Fermi arc in Bi2Sr2-xRxCuOy (R=La and Eu)

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