title: Universal versus material-dependent two-gap behaviors of the high-Tc cuprate superconductors: angle-resolved photoemission study of La2-xSrxCuO4.
abstract: We have investigated the doping and temperature dependences of the pseudogap and superconducting gap in the single-layer cuprate La2-xSrxCuO4 by angle-resolved photoemission spectroscopy. The results clearly exhibit two distinct energy and temperature scales, namely, the gap around (pi, 0) of magnitude Delta* and the gap around the node characterized by the d-wave order parameter Delta0. In comparison with Bi2212 having higher Tc's, Delta0 is smaller, while Delta* and T* are similar. This result suggests that Delta* and T* are approximately material-independent properties of a single CuO2 plane, in contrast to the material-dependent Delta0, representing the pairing strength.
authors: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors: T
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authors: Yoshida
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authors: Hashimoto
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authors: Ideta
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authors: Fujimori
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authors: Tanaka
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authors: Mannella
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authors: Hussain
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authors: Shen
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authors: Kubota
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authors: Ono
authors: Seiki
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authors: Komiya
authors: Yoichi
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authors: Ando
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authors: Eisaki
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authors: Uchida