Incoherent Interplane Conductivity of kappa-(BEDT-TTF)2Cu[N(CN)2]Br

J. J. McGuire; T. Room; A. Pronin; T. Timusk; J. A. Schlueter; M. E. Kelly; A. M. Kini

doi:10.1103/PhysRevB.64.094503

Incoherent Interplane Conductivity of kappa-(BEDT-TTF)2Cu[N(CN)2]Br

Superconductivity 2009-11-07 v1

Authors: J. J. McGuire , T. Room , A. Pronin , T. Timusk , J. A. Schlueter , M. E. Kelly , A. M. Kini

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Abstract

The interplane optical spectrum of the organic superconductor kappa-(BEDT-TTF)2Cu[N(CN)2]Br was investigated in the frequency range from 40 to 40,000 cm-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 tb = 0.1 meV. 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 ET molecule.

Keywords

low-lying excitations polydiacetylene Pariser-Parr-Pople Hamiltonian density matrix renormalization group exciton binding energy

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@article{arxiv.cond-mat/0103237,
  title  = {Incoherent Interplane Conductivity of kappa-(BEDT-TTF)2Cu[N(CN)2]Br},
  author = {J. J. McGuire and T. Room and A. Pronin and T. Timusk and J. A. Schlueter and M. E. Kelly and A. M. Kini},
  journal= {arXiv preprint arXiv:cond-mat/0103237},
  year   = {2009}
}

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7 pages with embedded figures, submitted to PRB

Incoherent Interplane Conductivity of kappa-(BEDT-TTF)2Cu[N(CN)2]Br

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