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Role of Interchain Hopping in the Magnetic Susceptibility of Quasi-One-Dimensional Electron Systems | | Yuki Fuseya
; Masahisa Tsuchiizu
; Yoshikazu Suzumura
; Claude Bourbonnais
; | | Date: |
30 Jun 2006 | | Subject: | Strongly Correlated Electrons | | Abstract: | The role of interchain hopping in quasi-one-dimensional (Q-1D) electron systems has been investigated by extending the Kadanoff-Wilson Renormalization Group (RG) 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, chi (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 temperature. It is shown that the interchain hopping, t_perp, reduces chi (T) at low temperatures, while it enhances chi(T) at high temperatures. This notable t_perp dependence is ascribed to the fact that t_perp enhances the antiferromagnetic spin fluctuation at low temperatures, while it suppresses the 1D fluctuation at high temperatures. The result is at variance with the RPA approach, which predicts an enhancement of chi (T) by t_perp over the whole temperature range. The influence of both the long-range repulsion and the nesting deviations on chi (T) is further investigated. The present results are discussed in connection with existing data of chi (T) in the (TMTTF)_2X and (TMTSF)_2X series of Q-1D organic conductors, for which a theoretical prediction for the effect of pressure on magnetic susceptibility is proposed. | | Source: | arXiv, cond-mat/0606795 | | Services: | Forum | Review | PDF | Favorites | |
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