Charge-sensitive vibrational modes in BEDT-TTF salts: Signatures of charge ordering and site charge
Abstract
BEDT-TTF-based organic conductors host a number of ground states, tuned by electron repulsion from Mott and charge ordered insulators to superconductors. Knowing charge distribution on the molecular sites in the insulating state of these materials is a key to understanding the origin of these ground states. We survey and discuss the C=C stretching modes in BEDT-TTF based molecular conductors. These molecular vibrations are extremely crucial in characterization of charge-ordered insulators, and are recently linked to superconductivity in some compounds. Focusing on the known examples of BEDT-TTF+0.5 salts, we analyse the reliability of the C=C stretching modes for the determination of charge ordering and absolute site charge. Considering the charge-ordered states, a prominent shift in frequency of 141 cm−1 per elementary charge e for ν27(b1u) and 98 cm−1e for ν2(ag) can be clearly realised, however, the distribution resulting from different compounds span over 20 cm−1. For nominal BEDT-TTF+0.5 compounds, the distribution of the resonance also extends around 20 cm−1, yielding an unexpected large uncertainty of Δρ ≈ ( ± 0.045)e, which is presumably due to the influence of small differences in the structure. This highlights the limitations of charge-frequency relations to detect small deviations in absolute charge values on molecular lattice sites, and emphasises on the use of the relations to estimate charge-ordering, rather than absolute site charge.
Versions
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BibTeX
@misc{priya2026chargesensitive,
title = {{Charge-sensitive vibrational modes in BEDT-TTF salts: Signatures of charge ordering and site charge}},
author = {Savita Priya and Martin Dressel and Jesse Liebman and Natalia Drichko},
howpublished = {arXiv},
year = {2026},
month = may,
doi = {10.48550/arxiv.2605.16012},
eprint = {2605.16012},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.16012},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Charge-sensitive vibrational modes in BEDT-TTF salts: Signatures of charge ordering and site charge
AU - Savita Priya
AU - Martin Dressel
AU - Jesse Liebman
AU - Natalia Drichko
PY - 2026
DA - 2026/05/15
PB - arXiv
DO - 10.48550/arxiv.2605.16012
UR - https://arxiv.org/abs/2605.16012
AB - BEDT-TTF-based organic conductors host a number of ground states, tuned by electron repulsion from Mott and charge ordered insulators to superconductors. Knowing charge distribution on the molecular sites in the insulating state of these materials is a key to understanding the origin of these ground states. We survey and discuss the C=C stretching modes in BEDT-TTF based molecular conductors. These molecular vibrations are extremely crucial in characterization of charge-ordered insulators, and are recently linked to superconductivity in some compounds. Focusing on the known examples of BEDT-TTF^+0.5 salts, we analyse the reliability of the C=C stretching modes for the determination of charge ordering and absolute site charge. Considering the charge-ordered states, a prominent shift in frequency of 141 cm^−1 per elementary charge e for ν_27(b_1u) and 98 cm^−1e for ν_2(a_g) can be clearly realised, however, the distribution resulting from different compounds span over 20 cm^−1. For nominal BEDT-TTF^+0.5 compounds, the distribution of the resonance also extends around 20 cm^−1, yielding an unexpected large uncertainty of Δρ ≈ ( ± 0.045)e, which is presumably due to the influence of small differences in the structure. This highlights the limitations of charge-frequency relations to detect small deviations in absolute charge values on molecular lattice sites, and emphasises on the use of the relations to estimate charge-ordering, rather than absolute site charge.
ER -