English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have in detail characterized the anisotropic charge response of the dimerMott insulator $\kappa$-(BEDT-TTF)$_2$\-Cu$_2$(CN)$_3$ by dc conductivity, Halleffect and dielectric spectroscopy. At room temperature the Hall coefficient ispositive and close to the value expected from stoichiometry; the temperaturebehavior follows the dc resistivity $\rho(T)$. Within the planes the dcconductivity is well described by variable-range hopping in two dimensions;this model, however, fails for the out-of-plane direction. An unusually broadin-plane dielectric relaxation is detected below about 60 K; it slows down muchfaster than the dc conductivity following an Arrhenius law. At around 17 K wecan identify a pronounced dielectric anomaly concomitantly with anomalousfeatures in the mean relaxation time and spectral broadening. The out-of-planerelaxation, on the other hand, shows a much weaker dielectric anomaly; itclosely follows the temperature behavior of the respective dc resistivity. Atlower temperatures, the dielectric constant becomes smaller both within andperpendicular to the planes; also the relaxation levels off. The observedbehavior bears features of relaxor-like ferroelectricity. Becauseheterogeneities impede its long-range development, only a weak tunneling-likedynamics persists at low temperatures. We suggest that the random potential anddomain structure gradually emerge due to the coupling to the anion network.

Anisotropic charge dynamics in the quantum spin-liquid candidate $\kappa$-(BEDT-TTF)$_2$Cu$_2$(CN)$_3$