Polarized reflectance spectra of organic metals α- and κ-(BEDT-TTF) 2Cu(NCS) 2 and κ-(BEDT-TTFd8) 2Cu(NCS) 2

Polarized reflectance spectra of two different phases (α- and κ-) of (BEDT-TTF) 2Cu(NCS) 2 as well as κ-(BEDT-TTFd8) 2Cu(NCS) 2 were measured over the spectral range from 800 cm −1 to 9000 cm −1. A clear reflectance drop with the plasma-edge like dispersion was observed for polarization parallel to...

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Bibliographic Details
Published in:Synthetic metals 1988-12, Vol.27 (1), p.A171-A176
Main Authors: Tokumoto, M, Anzai, H, Takahashi, K, Kinoshita, N, Murata, K, Ishiguro, T, Tanaka, Y, Hayakawa, Y, Nagamori, H, Nagasaka, K
Format: Article
Language:English
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Summary:Polarized reflectance spectra of two different phases (α- and κ-) of (BEDT-TTF) 2Cu(NCS) 2 as well as κ-(BEDT-TTFd8) 2Cu(NCS) 2 were measured over the spectral range from 800 cm −1 to 9000 cm −1. A clear reflectance drop with the plasma-edge like dispersion was observed for polarization parallel to any directions in the conducting b-c plane in both κ-(BEDT-TTF) 2Cu(NCS) 2 and κ-(BEDT-TTFd8) 2Cu(NCS) 2. Small in-plane anisotropy reflects the characteristics stacking configuration of dimerized BEDT-TTF molecules in the crystal structure similar to κ-(BEDT-TTF) 2I 3, rather than the highly two-dimensional electronic structure within the conducting plane. In contrast, optical properties of α-(BEDT-TTF) 2Cu(NCS) 2, having a herring-bone type stacking of donors, was found to show higher reflectivity when the polarization was perpendicular to the stacking direction, similar to the case of α-(BEDT-TTF) 2I 3.
ISSN:0379-6779
1879-3290
DOI:10.1016/0379-6779(88)90397-9