Quantum antiferromagnetism in the d=3 Hubbard model --- a\n spin-fluctuation approach

1998/02/04 by A. Singh, Avinash Singh, Singh, Avinash
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/9802047

7 pages references, additional work added

openalex publication_date 1998/02/04 · arxiv created 1998/05/28 · arxiv updated 2009/11/30 · openalex created_date 2022/10/01 · openalex updated_date 2026/07/28

Abstract

A self-consistent spin-fluctuation theory is developed to obtain T_N vs. U\nfor the half-filled Hubbard antiferromagnet in the whole U/t range. Good\nagreement is obtained in the strong coupling limit with the high-temperature\nseries-expansion result for the equivalent Heisenberg model. Quantum,\nspin-fluctuation correction to the sublattice magnetization is also obtained\nfor all U at the one-loop level. A spin picture is used throughout, and quantum\neffects are incorporated through transverse spin fluctuations, which are\nevaluated in the RPA using a new method.\n

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