Role of Interchain Hopping in the Magnetic Susceptibility of Quasi-One-Dimensional Electron Systems(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

A 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...