Schedule Nov 18, 2002
Differences in the electronic structure of the CuO2 plane between different cuprate systems
Atsushi Fujimori, University of Tokyo
http://wyvern.phys.s.u-tokyo.ac.jp/welcome_en.html
Comparison has been made between the electronic structure of the CuO2 plane in La2-xSrxCuO4 (LSCO), Bi2212 and YBa2Cu3Oy (YBCO), and the following observations have been made:
(i) The dispersion of the lower Hubbard band of the undoped (or lightly doped) materials along the "remnant Fermi surface" is weakest in LSCO.
(ii) The large pseudogap corresponding to the flat band at k ~ (pi,0) in underdoped materials is found to be the smallest in LSCO.
(iii) The chemical potential moves most slowly as a function of hole doping in LSCO. These results together with the Fermi-surface shape indicate that the next-nearest-neighbor hopping t' in the extended t-J model has the smallest magnitude in LSCO, while J is common among the different systems. This implies that differences in t' is important for the different electronic properties, including the tendency to form charge stripes, and possibly for the different maximum Tc's between the different systems [1].

This work has been done in collaboration with: K. Tanaka, T. Yoshida, H. Yagi, Z.-X. Shen, X.-J. Zhou, H. Eisaki, Z. Hussain, S. Uchida, T. Sugaya, I. Terasaki, K. Segawa, A.N. Lavrov, and Y. Ando.

[1] E. Pavarini et al., Phys. Rev. Lett. 87, 047003 (2001).

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