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Phys. Rev. B 70, 092503 (2004) [4 pages]

Effects of next-nearest-neighbor hopping t′ on the electronic structure of cuprate superconductors

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K. Tanaka1, T. Yoshida1, A. Fujimori1, D. H. Lu2, Z.-X. Shen2, X.-J. Zhou2,3, H. Eisaki2, Z. Hussain3, S. Uchida1, Y. Aiura4, K. Ono5, T. Sugaya6, T. Mizuno6, and I. Terasaki6
1Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Tokyo, 113-0033, Japan
2Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, USA
3Advanced Light Source, Lawrence Berkely National Lab, Berkeley, California 94720, USA
4National Institute for Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8568, Japan
5Photon Factory, IMSS, High Energy Accelerator Research Organization, Tsukuba, 305-0801, Japan
6Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan

Received 14 April 2004; published 17 September 2004

Photoemission spectra of underdoped and lightly-doped Bi2−zPbzSr2Ca1−xRxCu2O8+y (R=Pr, Er) (BSCCO) have been measured and compared with those of La2−xSrxCuO4 (LSCO). The lower-Hubbard band of the insulating BSCCO, like Ca2CuO2Cl2, shows a stronger dispersion than La2CuO4 from k∼(π∕2,π∕2) to ∼(π,0). The flat band at k∼(π,0) is found generally deeper in BSCCO. These observations together with the Fermi-surface shapes and the chemical potential shifts indicate that the next-nearest-neighbor hopping ∣t′∣ of the single-band model is larger in BSCCO than in LSCO and that ∣t′∣ rather than the super-exchange J influences the pseudogap energy scale.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.092503
DOI:
10.1103/PhysRevB.70.092503
PACS:
74.72.Hs, 71.28.+d, 79.60.−i
 
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