The role of in-plane oxygens in optimally doped NCCO (CROSBI ID 128038)
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Podaci o odgovornosti
Sunko, Denis K. ; Barišić, Slaven
engleski
The role of in-plane oxygens in optimally doped NCCO
Within the framework of the three-band Hubbard (Emery) model of high-temperature superconductors, we find a new physical regime for the electron-doped compound NCCO at optimal doping. It is characterized by a strong renormalization of the bare copper-oxygen hopping, similar to the one occuring on the hole-doped side, and a low value of the effective copper-oxygen splitting. The effective copper-oxygen hopping appears smaller than the direct oxygen-oxygen hopping, which is not renormalized. After a zeroth-order fit of the Fermi surface is achieved, ARPES data throughout the zone are reproduced by adding a simple phenomenological weak-coupling antiferromagnetic perturbation of the conduction electrons. The dispersive antiferromagnons have low energy, but no long-range order. We can show that the experimental situation corresponds to a pseudogap across the whole Fermi surface. The wide dispersive features in NCCO ARPES spectra are analogous to the hump in BSCCO. The oxygen degree of freedom dominates the band structure of both NCCO and BSCCO, however in NCCO this cannot be demonstrated without simultaneously accounting for the antiferromagnetic scattering. The difference in Tc of the two compounds may be related to the difference in the calculated densities of states.
ARPES; pseudogap; high-Tc; superconductivity
Pozvano predavanje na 5th International Conference Stripes06, Rim, Italija, 17.12.-22.12.2006.
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Podaci o izdanju
20 (7)
2007.
623-627
objavljeno
1557-1939
10.1007/s10948-007-0250-7