Evidence for charge order in organic superconductors obtained by vibrational spectroscopy
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
We study charge disproportionation in few quasi-two-dimensional BEDT-TTF-based compounds by following the temperature dependence of a charge-sensitive vibration ν27 (B1 u) of BEDT-TTF molecule. While in a charge ordered insulator θ-(BEDT-TTF)2RbZn(SCN)4 a difference between charge on the lattice sites is as high as 0.6e, a small charge disproportionation of 0.15-0.2e is found in two metallic compounds that become superconducting at low temperatures β″-(BEDT-TTF)2SF5CH2CF2SO3 and β -(EDT-TTF)4 [Hg3 I8](1 - x). In contrast to these, a pure metallic β″-(BEDT-TTF)2SO3CHFSF5 does not show any presence of charge disproportionation. This study suggests a correlation between a slight charge disproportionation in the metallic state and superconductivity.
Details
Original language | English |
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Pages (from-to) | 490-493 |
Number of pages | 4 |
Journal | Physica B: Condensed Matter |
Volume | 404 |
Issue number | 3-4 |
Publication status | Published - 2009 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
ORCID | /0000-0001-9862-2788/work/142255402 |
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Keywords
ASJC Scopus subject areas
Keywords
- Charge order, Organic conductors, Superconductivity