The ubiquitous 1100 charge ordering in organic charge-transfer solids

TL;DR

This paper demonstrates that the 1100 charge ordering pattern is universally present in 1/4-filled organic charge-transfer solids, challenging previous mean field predictions and aligning well with experimental observations across various materials.

Contribution

The study reveals the universal presence of the 1100 charge order in organic charge-transfer solids, providing detailed computational analysis that aligns with experimental data.

Findings

Charge order in 1D and 2D CT solids is of the 1100 type.

Complete agreement with experimental data in several theta systems.

Ubiquity of the 1100 charge ordering pattern across different materials.

Abstract

Charge and spin-orderings in the 1/4-filled organic CT solids are of strong interest, especially in view of their possible relations to organic superconductivity. We show that the charge order (CO) in both 1D and 2D CT solids is of the ...1100... type, in contradiction to mean field prediction of >...1010... CO. We present detailed computations for metal-insulator and magnetic insulator-insulator transitions in the theta-ET materials. Complete agreement with experiments in several theta systems is found. Similar comparisons between theory and experiments in TCNQ, TMTTF, TMTSF, and ET materials prove the ubiquity of this phenomenon.