2006/06/30 by Yuki Fuseya, Masahisa Tsuchiizu, Yoshikazu Suzumura +1
Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.76.014709
published as Journal of the Physical Society of Japan Vol. 76 No. 1, January, 2007, 014709 (17 pages) · 17 pages, 19figures
openalex publication_date 2007/01/10 · arxiv created 2007/01/23 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The role of interchain hopping in quasi-one-dimensional (Q-1D) electron systems is investigated by extending the Kadanoff-Wilson renormalization group of one-dimensional (1D) systems to Q-1D systems. This scheme is applied to the extended Hubbard model to calculate the temperature (T) dependence of the magnetic susceptibility, χ (T). The calculation is performed by taking into account not only the logarithmic Cooper and Peierls channels, but also the non-logarithmic Landau and finite momentum Cooper channels, which give relevant contributions to the uniform response at finite temperatures. It is shown that the interchain hopping, t_⊥, reduces χ (T) at low temperatures, while it enhances χ(T) at high temperatures. This notable t_⊥ dependence is ascribed to the fact that t_⊥ enhances the antiferromagnetic spin fluctuation at low temperatures, while it suppresses the 1D fluctuation at high temperatures. The result is at variance with the random-phase-approximation approach, which predicts an enhancement of χ (T) by t_⊥ over the whole temperature range. The influence of both the long-range repulsion and the nesting deviations on χ (T) is further investigated. We discuss the present results in connection with the data of χ (T) in the (TMTTF)2X and (TMTSF)2X series of Q-1D organic conductors, and propose a theoretical prediction for the effect of pressure on magnetic susceptibility.