Effects of next-nearest-neighbor hopping t' on the electronicstructure of cuprate superconductors
Photoemission spectra of underdoped and lightly-doped Bi{sub 2-z}Pb{sub z}Sr{sub 2}Ca{sub 1-x}R{sub x}Cu{sub 2}O{sub 8+y} ( R=Pr , Er ) (BSCCO) have been measured and compared with those of La{sub 2-x}Sr{sub x}CuO{sub 4} (LSCO). The lower-Hubbard band of the insulating BSCCO, like Ca{sub 2}CuO{sub 2}Co{sub 2}, shows a stronger dispersion than La{sub 2}CuO{sub 4} from k-({pi}/2,{pi}/2) to -({pi},0). The flat band at k-({pi},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{prime}| of the single-band model is larger in BSCCO than in LSCO and that |t{prime}| rather than the super-exchange J influences the pseudogap energy scale.
- Research Organization:
- COLLABORATION - U.Tokyo
- DOE Contract Number:
- AC02-05CH11231
- OSTI ID:
- 928230
- Report Number(s):
- LBNL--58355
- Journal Information:
- Physics Review B, Journal Name: Physics Review B Vol. 70
- Country of Publication:
- United States
- Language:
- English
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