Effect of Inter-Site Repulsions on Magnetic Susceptibility of One-Dimensional Electron Systems at Quarter-Filling

TL;DR

This study investigates how inter-site electron interactions influence the temperature-dependent magnetic susceptibility in one-dimensional quarter-filled electron systems, revealing significant enhancements due to nearest-neighbor interactions and connecting findings to experimental organic conductors.

Contribution

The paper introduces a detailed analysis of inter-site interactions' effects on magnetic susceptibility using renormalization-group methods, highlighting the dominant role of nearest-neighbor interactions.

Findings

Nearest-neighbor interactions strongly enhance hi(T)

Enhancement of hi(T) exceeds that from next-nearest-neighbor interactions

Predictions align with experimental data in quasi-one-dimensional organic conductors

Abstract

The temperature dependence of the magnetic susceptibility, \chi (T), is investigated for one-dimensional interacting electron systems at quarter-filling within the Kadanoff-Wilson renormalization-group method. The forward scattering on the same branch (the g_4-process) is examined together with the backward (g_1) and forward (g_2) scattering amplitudes on opposite branches. In connection with lattice models, we show that \chi (T) is strongly enhanced by the nearest-neighbor interaction, an enhancement that surpasses one of the next-nearest-neighbor interaction. A connection between our predictions for \chi (T) and experimental results for \chi (T) in quasi-one-dimensional organic conductors is presented.