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Comparison of the Emery Model Band Structure and the ARPES data for the high-Tc superconductors (CROSBI ID 484853)

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Mrkonjić, Ivana ; Barišić, Slaven Comparison of the Emery Model Band Structure and the ARPES data for the high-Tc superconductors // Jahrestagung in Lausanne, 28. Februar-1. Marz 2002 / SPS (ur.). Lausanne: SPS, 2002. str. 39-x

Podaci o odgovornosti

Mrkonjić, Ivana ; Barišić, Slaven

engleski

Comparison of the Emery Model Band Structure and the ARPES data for the high-Tc superconductors

The average band structure of the extended Emery model for the CuO2 planes is calculated, in which, due to the strong hole correlations on the Cu site, the copper-related parameters are assumed to renormalise with doping. This band structure is then used to fit Fermi surfaces (FS) and energy bands of LSCO, Bi2212 and Y123, measured in ARPES experiments. The evolution of the FS with the doping, observed in LSCO, is associated with strong renormalisation of Cu-O site energy difference and Cu-O overlap integral with respect to the direct O-O overlap. Thus obtained two-parameter band-fits agree excelentlly with the ARPES data. The physically important result that Cu-O site energy difference is the smallest parameter in the underdoped regime, observed also in Bi2212 and Y123, points out the importance of the fluctuations involving three sites, instead of one site, implicitly assumed in widely used Hubbard model.

Emery model; high-Tc superconductors; effective band-structure; correaltion effects

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Podaci o prilogu

39-x.

2002.

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objavljeno

Podaci o matičnoj publikaciji

Jahrestagung in Lausanne, 28. Februar-1. Marz 2002

SPS

Lausanne: SPS

Podaci o skupu

Jahrestagung-Reunion Anuelle 2002

predavanje

28.02.2002-01.03.2002

Lausanne, Švicarska

Povezanost rada

Fizika