Many-body coherent potential approximation, dynamical coherent potential approximation, and dynamical mean-field theory

Y. Kakehashi
Phys. Rev. B 66, 104428 – Published 27 September 2002
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Abstract

The coherent potential approximation (CPA) is a useful tool to describe the electron correlations as well as the effects of disorder on electrons. Among various theories of correlated electron systems, the many-body CPA, the dynamical CPA, and the dynamical mean-field theory have been investigated in great detail from the viewpoint of the CPA. It is demonstrated that these three theories are equivalent to each other, so that the theories of itinerant magnetism and those of the strongly correlated electron systems are unified within the single-site approximation. This explains why the Néel temperatures calculated by the dynamical mean-field theory agree well with the ones calculated by the classical and adiabatic versions of the dynamical CPA, the single-site spin-fluctuation theory, and the variational approach.

  • Received 6 February 2002

DOI:https://doi.org/10.1103/PhysRevB.66.104428

©2002 American Physical Society

Authors & Affiliations

Y. Kakehashi

  • Max-Planck Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden, Germany

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Issue

Vol. 66, Iss. 10 — 1 September 2002

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