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Anions effects on the electronic structure and electrodynamic properties of the Mott insulator $\kappa$-(BEDT-TTF)$_2$Ag$_2$(CN)$_{3}$
- Source :
- Phys. Rev. B 94, 161105 (2016)
- Publication Year :
- 2016
-
Abstract
- The Mott insulator $\kappa$-(BEDT-TTF)$_2$Ag$_2$(CN)$_3$ forms a highly-frustrated triangular lattice of $S=1/2$ dimers with a possible quantum-spin-liquid state. Our experimental and numerical studies reveal the emergence of a slight charge imbalance between crystallographically inequivalent sites, relaxor dielectric response and hopping dc transport. In a broader perspective we conclude that the universal properties of strongly-correlated charge-transfer salts with spin liquid state are an anion-supported valence band and cyanide-induced quasi-degenerate electronic configurations in the relaxed state. The generic low-energy excitations are caused by charged domain walls rather than by fluctuating electric dipoles. They give rise to glassy dynamics characteristic of dimerized Mott insulators, including the sibling compound $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$.<br />Comment: 5 pages, 6 figures, submitted to Physical Review B Rapid Communications
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 94, 161105 (2016)
- Publication Type :
- Report
- Accession number :
- edsarx.1607.07596
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.94.161105