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Modulation of pairing interaction in Bi₂Sr₂CaCu₂O_(8+δ) by an O dopant: a density functional theory study

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arxiv 1006.2014 v2 pith:SIU5GX2Q submitted 2010-06-10 cond-mat.supr-con

Modulation of pairing interaction in Bi₂Sr₂CaCu₂O_(8+δ) by an O dopant: a density functional theory study

Kateryna Foyevtsova , H. C. Kandpal , Harald O. Jeschke , S. Graser , H.-P. Cheng , Roser Valent\'i , P. J. Hirschfeld This is my paper
classification cond-mat.supr-con
keywords dopantpairingenhancedtheorycacudeltadensityfunctional
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Scanning tunneling spectroscopy measurements on the high temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ have reported an enhanced spectral gap in the neighborhood of O dopant atoms. We calculate, within density functional theory (DFT), the change in electronic structure due to such a dopant. We then construct and discuss the validity of several tight binding (TB) fits to the DFT bands with and without an O dopant. With the doping-modulated TB parameters, we finally evaluate the spin susceptibility and pairing interaction within spin fluctuation theory. The d-wave pairing eigenvalues are enhanced above the pure system without O dopant, supporting the picture of enhanced local pairing around such a defect.

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