Universal versus Material-Dependent Two-Gap Behaviors of the High-TcCuprate Superconductors: Angle-Resolved Photoemission Study ofLa2−xSrxCuO4
Physical Review Letters2009Vol. 103(3), pp. 037004–037004
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T. Yoshida, Makoto Hashimoto, S. Ideta, A. Fujimori, Kiyohisa Tanaka, N. Mannella, Z. Hussain, Zhi‐Xun Shen, Masato Kubota, Kanta Ono, Seiki Komiya, Yoichi Ando, Hiroshi Eisaki, S. Uchida
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.
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