Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.037004
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Funding
- Ministry of Education, Science, Culture, Sports and Technology
- U. S. DOE [DE-FG03-01ER45876, DE-AC03-76SF00098]
- KAKENHI [19674002, 20030004]
- Department of Energy's Office of Basic Energy Science
- Division of Materials Science. Experiment at the Photon Factory
- Photon Factory Program Advisory Committee [2006S2-001]
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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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