Phys. Rev. Lett. 95, 227801 (2005) [4 pages]Collapse of Coherent Quasiparticle States in θ-(BEDT-TTF)2I3 Observed by Optical SpectroscopyReceived 14 December 2004; published 23 November 2005 Optical conductivity measurements on the organic metal θ-(BEDT-TTF)2I3 revealed that the system crosses over rapidly from a coherent quasiparticle state to an incoherent state with temperature. Despite the metallic temperature dependence of resistivity, a well-defined Drude peak at low temperatures turns into a far-infrared peak with temperature. The peak energy shifts to higher frequencies and, simultaneously, the spectral weight is transferred to high frequencies beyond the electron band width. These characteristics imply that θ-(BEDT-TTF)2I3, so far believed to be a typical metal, is in fact a strongly correlated electron system with “bad-metal” character. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.227801
DOI:
10.1103/PhysRevLett.95.227801
PACS:
78.30.Jw, 71.27.+a, 72.15.−v
See AlsoComment: O. Gunnarsson and K. Vafayi, Comment on “Collapse of Coherent Quasiparticle States in θ-(BEDT-TTF)2I3 Observed by Optical Spectroscopy”, Phys. Rev. Lett. 98, 219802 (2007). Reply: K. Takenaka, M. Tamura, N. Tajima, H. Takagi, J. Nohara, and S. Sugai, Takenaka et al. Reply:, Phys. Rev. Lett. 98, 219803 (2007). |
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