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

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

2001-03-12

arxiv.org/abs/cond-mat/0103237v1

Phys. Rev. B 64, 94503 (2001).

Physics

Condensed Matter

Superconductivity

7 pages with embedded figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.64.094503

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.

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