2001/03/12 by J. J. McGuire, T. Room, T. Rõõm +8 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Molecular Junctions and Nanostructures #Organic and Molecular Conductors Research #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.64.094503
published as Phys. Rev. B 64, 94503 (2001). · 7 pages with embedded figures, submitted to PRB
arxiv created 2001/03/12 · openalex publication_date 2001/07/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The interplane optical spectrum of the organic superconductor \ensuremathκ\ensuremath-(BEDT\ensuremath-TTF)2Cu[N(CN)2]Br was investigated in the frequency range from 40 to 40000 cm^\ensuremath-1. The optical conductivity was obtained by Kramers-Kronig analysis of the reflectance. The absence of a Drude peak at low frequency is consistent with incoherent conductivity but in apparent contradiction to the metallic temperature dependence of the dc resistivity. We set an upper limit to the interplane transfer integral of tb2/tac\ensuremath≈10^\ensuremath-7 eV. A model of defect-assisted interplane transport can account for this discrepancy. We also assign the phonon lines in the conductivity to the asymmetric modes of the BEDT-TTF molecule.