Naslov
Anion effects on the electronic structure and electrodynamic properties of the Mott insulator kappa$-(BEDT-TT$_2Ag2(CN)3

Autori
Pinterić, Marko ; Lazić, Predrag ; Pustogow, Andrej ; Ivek, Tomislav ; Kuveždić, Marko ; Milat, Ognjen ; Gumhalter, Branko ; Basletić, Mario ; Čulo, Matija ; Korin-Hamzić, Bojana ; Loehle Anja ; Huebner, R ; Sanz Alonso, M ; Hiramatsu, T ; Yoshida Y ; Saito, Gunzi ; Dressel, Martin ; Tomić, Silvia

Izvornik
Physical review. B, Rapid communication (1082-586X) 94 (2016), 16; 161105 (R), 6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Mott insulator ; quantum spin liquid ; relaxor dielectric relaxation ; DFT calculations ; strongly correlated systems

Sažetak
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)$_3$.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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