Universal Relations in the Attractive Hubbard Model with Next-Nearest Neighbor Hopping

• Authors: M Bak
• Languages of publication: EN

Abstracts

EN

Recently a new universal relation between superfluid densityρ_s andσ_{dc}T_c, where σ_{dc} is direct current conductivity and T_c - superconducting critical temperature, was found by Homes et al. (Nature 430, 539 (2004)). The theoretical derivation of the relation based on BCS theory is correct only qualitatively. In the present paper this relation is calculated theoretically, using Hartree-Fock approximation and second-order perturbation theory. It is found that although correct qualitatively, quantitatively the results are too small. Inclusion of the second neighbor hopping improves the results.

Keywords

EN

74.25.Fy; 71.10.Fd; 74.20.Fg; 71.27.+a; 72.10.-d

Discipline

• 74.20.Fg: BCS theory and its development
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)
• 72.10.-d: Theory of electronic transport; scattering mechanisms

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2006
• Volume: 109
• Issue: 4-5
• Pages: 565-568

Dates

published

2006-04

received

2005-09-25

Contributors

author

M Bak

• Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.109.565