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

被引：112
作者：
Yoshida, T. [1 ]
Hashimoto, M. [1 ]
Ideta, S. [1 ]
Fujimori, A. [1 ]
Tanaka, K. [2 ,3 ]
Mannella, N. [2 ,3 ]
Hussain, Z. [4 ]
Shen, Z. -X. [2 ,3 ]
Kubota, M. [5 ]
Ono, K. [5 ]
Komiya, Seiki [6 ]
Ando, Yoichi [7 ]
Eisaki, H. [8 ]
Uchida, S. [1 ]
机构：
[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan
[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
[3] Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA
[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA
[5] KEK, Inst Mat Struct Sci, Photon Factory, Tsukuba, Ibaraki 3050801, Japan
[6] Cent Res Inst Elect Power Ind, Tokyo 2018511, Japan
[7] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan
[8] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 03期
关键词：
UNDERDOPED BI2212; PSEUDOGAP; GAP; LIQUID; STATE; PHASE; MODEL;
D O I：
10.1103/PhysRevLett.103.037004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 Delta(0). In comparison with Bi2212 having higher T-c's, Delta(0) 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 Delta(0), representing the pairing strength.
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页数：4
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