Abstract
Quasi-two-dimensional Mott insulators based on BEDT-TTF molecules have recently demonstrated a variety of exotic states, which originate from electron–electron correlations and geometrical frustration of the lattice. Among those states are a triangular S = 1/2 spin liquid and quantum dipole liquid. In this article, we show the power of Raman scattering technique to characterize magnetic and electronic excitations of these states. Our results demonstrate a distinction between a spectrum of magnetic excitations in a simple Mott insulator with antiferromagnetic interactions, and a spectrum of an insulator with an additional on-site charge degree of freedom.
Highlights
In recent years, a number of materials with very interesting properties produced by electronic correlations have been found among organic conductors and insulators
We show the data obtained at low temperatures around 10 K for two polarizations which would correspond to A1g and B1g scattering channels in a square magnetic unit cell of κ-(BEDT-TTF)2 Cu[N(CN)2 ]Cl (Figure 1b)
We present our results on the Raman spectra of four κ-phase BEDT-TTF-based compounds
Summary
A number of materials with very interesting properties produced by electronic correlations have been found among organic conductors and insulators. Intriguing ferroelectric properties of spin liquid candidates [13,14,15,16], and recently a quantum dipole liquid state [17] were observed for the κ-phase BEDT-TTF-based compounds, where BEDT-TTF stands for bis(ethylenedithio)tetrathiafulvalene. These results suggest an importance of a charge degree of freedom in the Mott insulator state. Some of the results still present a conflicting picture; for example, while ferroelectricity
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