Naslov
Magnetic ordering and charge dynamics in kappa-(BEDT-TTF)2Cu[N(CN)2]Cl

Autori
Tomić, Silvia ; Pinterić, Marko ; Ivek, Tomislav ; Sedlmeier, K. ; Beyer, R. ; Wu, D. ; Schlueter J.A. ; Schweitzer, Dieter ; Dressel, Martin

Izvornik
Journal of physics. Condensed matter (0953-8984) 25 (2013); 436004-1

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

Ključne riječi
magnetic and charge oredring; ferroelelectricity; multiferroic; domain walls; spin-charge coupling; quantum eletric dipoles

Sažetak
\begin{; ; ; ; abstract}; ; ; ; The Mott insulator $\kappa$-(BE\-DT\--TTF)$_2$\-Cu\-[N\-(CN)$_{; ; ; ; 2}; ; ; ; $]Cl consists of molecular dimers arranged on an anisotropic triangular lattice. At low temperatures a pronounced dielectric anomaly is observed and eventually a canted antiferromagnetic ground state forms. Optical spectroscopy clearly rules out charge imbalance and the existence of quantum electric dipoles with a dipolar spin coupling. Here we suggest a novel form of spin-charge coupling where the prominent in-plane dielectric response in $\kappa$-(BE\-DT\--TTF)$_2$\-Cu\-[N\-(CN)$_{; ; ; ; 2}; ; ; ; $]Cl is explained by short-range discommensurations of the antiferromagnetic phase in the temperature range $30 < T < 50$~K, and by relaxation of charged domain walls in the ferromagnetic structure at lower temperatures. \end{; ; ; ; abstract}; ; ; ;

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA