Naslov
What is the origin of anomalous dielectric response in 2D organic dimer Mott insulators kappa-(BEDT-TTF)_2Cu[N(CN)_2]Cl and kappa-(BEDT-TTF)_2Cu_2(CN)_3

Autori
Pinterić, Marko ; Ivek, Tomislav ; Čulo, Matija ; Milat, Ognjen ; Basletić, Mario ; Korin-Hamzić, Bojana ; Tafra, Emil ; Hamzić, Amir ; Dressel, Martin ; Tomić, Silvia

Izvornik
Physica. B, Condensed matter (0921-4526) 460 (2015); 202-207

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

Ključne riječi
Molecular solids with reduced dimensionality; Mott insulators; Quantum spin liquid; Dielectric response

Sažetak
Novel forms of the low-temperature phases in the two-dimensional molecular solids with competing interactions between charges, spins and lattice, in particular those featuring anomalous dielectric relaxation, have been the focus of intense activity in recent years. Open issues concern the nature of collective charge excitations as well as their coupling to applied ac and dc electric fields. The charge response is reasonably well understood by now in the charge-ordered phase with the formation of ferroelectric-like domains below the metal-to-insulator phase transition. Conversely, the dielectric response observed in dimer Mott insulator phases with no complete evidence for charge ordering is rather intriguing. We overview our recent results of anisotropic complex conductivity (dc - MHz) in the magnetic phase of kappa-(BEDT-TTF)_2Cu[N(CN)_2]Cl and in the spin-liquid phase of kappa-(BEDT-TTF)_2Cu_2(CN)_3. We discuss possible explanations for the observed dynamics within current theoretical models and compare them with the well-known fingerprints of the spin density wave response to ac electric fields.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Special Issue on Electronic Crystals (ECRYS-2014).

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