Universal versus material-dependent two-gap behaviors of the high-Tc cuprate superconductors: angle-resolved photoemission study of La2-xSrxCuO4.
Universal versus material-dependent two-gap behaviors of the high-Tc cuprate superconductors: angle-resolved photoemission study of La2-xSrxCuO4.
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DOI：
10.1103/physrevlett.103.037004
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发表时间：
2008-11
影响因子：
8.6
通讯作者：
T. Yoshida;M. Hashimoto;S. Ideta;A. Fujimori;K. Tanaka;N. Mannella;Z. Hussain;Z. Shen;M. Kubo
中科院分区：
文献类型：
--
作者：
T. Yoshida;M. Hashimoto;S. Ideta;A. Fujimori;K. Tanaka;N. Mannella;Z. Hussain;Z. Shen;M. Kubo
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.
