TITLE

LCAO model for 3D Fermi surface of high-Tc cuprate Tl2Ba2CuO6+δ

AUTHOR(S)
Stoev, M.; Mishonov, T.M.
PUB. DATE
January 2010
SOURCE
European Physical Journal B -- Condensed Matter;Jan2010, Vol. 73 Issue 1, p109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A simple analytical formula for three-dimensional Fermi surface (3D FS) of ${\rm Tl}_2{\rm Ba}_2{\rm CuO}_{6+\delta}$ is derived in the framework of LCAO approximation spanned over Cu 4 s, Cu 3d $3d_{x^2 - y^2 }$, O 2px and O 2py states. This analytical result can be used for fitting of experimental data for 3D FS such as polar angle magnetoresistance oscillation. The model takes into account effective copper-copper hopping amplitude tss between Cu 4s orbitals from neighbouring ${\textrm{CuO}_2}$ layers. The acceptable correspondence with the experimental data gives a hint that the tss amplitude dominates in formation of coherent 3D FS, and other oxygen-oxygen and copper-oxygen amplitudes are rather negligible. For absolute determination of the hopping parameters a simple electronic experiment with a field effect transistor type microstructure is suggested. The thin superconductor layer is the source-drain channel of the layered structure where an AC current is applied.
ACCESSION #
47409936

 

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