Optical sum in nearly antiferromagnetic Fermi liquid model

E. Schachinger and J. P. Carbotte

Phys. Rev. B 72, 014535 – Published 22 July 2005

Abstract

We calculate the optical sum (OS) and the kinetic energy (KE) for a tight binding band in the nearly antiferromagnetic Fermi liquid model which has had some success in describing the electronic structure of the high- $T_{c}$ cuprates. The interactions among electrons due to the exchange of spin fluctuations profoundly change the probability of occupation $(n_{k, σ})$ of states of momentum $k$ and spin $σ$ which is the central quantity in the calculations of OS and KE. Normal and superconducting states are considered as a function of temperature. Both integrals are found to depend importantly on interactions and an independent electron model is inadequate.

Received 20 December 2004

DOI:https://doi.org/10.1103/PhysRevB.72.014535

Authors & Affiliations

E. Schachinger^1,* and J. P. Carbotte²

¹Institute of Theoretical and Computational Physics, Graz University of Technology, A-8010 Graz, Austria
²Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 Canada

^*Electronic address: schachinger@itp.tu-graz.ac.at; URL: www.itp.tu-graz.ac.at∕̃ewald

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Vol. 72, Iss. 1 — 1 July 2005

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