Abstract
We investigated the electronic states of a quantum spin liquid candidate material, κ-(BEDT-TTF)2Ag2(CN)3, using optical methods. In reflectivity measurements, we observed the polarization dependence of electronic transitions, which reflects the crystal structure and anisotropic charge excitation. Raman scattering measurements revealed that the broad magnetic excitation mode is located below 600 cm−1. This spectral feature indicates the spin-liquid nature of the candidate material. The charge-sensitive molecular-vibrational modes observed in infrared and Raman spectra are broader than those of typical BEDT-TTF compounds, which indicate a possibility of dynamic charge fluctuation. By comparing the optical spectra of κ-(BEDT-TTF)2Ag2(CN)3 with a well-investigated spin-liquid candidate κ-(BEDT-TTF)2Cu2(CN)3, we found common optical properties of BEDT-TTF-based spin-liquid candidates. The dynamic fluctuations of charge on a BEDT-TTF dimer are independent of the arrangement of BEDT-TTF molecules and anion layers.
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