Comment on ``Collapse of Coherent Quasiparticle States in $θ$-(BEDT-TTF)$_2$I$_3$ Observed by Optical Spectroscopy''

Details Comment on ``Collapse of Coherent Quasiparticle States in $θ$-(BEDT-TTF)$_2$I$_3$ Observed by Optical Spectroscopy'' Comment on ``Collapse of Coherent Quasiparticle States in $θ$-(BEDT-TTF)$_2$I$_3$ Observed by Optical Spectroscopy''

2007-05-02

arxiv.org/abs/0705.0230v1

Physics

Condensed Matter

Materials Science

1 page, 1figure

Scientific paper

10.1103/PhysRevLett.98.219802

Recently, Takenaka et al. reported that the resistivity rho(T) of theta-(BEDT-TTF)_2I_3 (theta-ET) exceeds the Ioffe-Regel resistivity by a factor of 50 at large temperatures T (``bad metal''). This was ascribed to strong correlation. We argue that the optical conductivity sigma(omega) implies that correlation is not very strong, and that correlation gives no general strong suppression of sigma(omega). The large rho(T) is primarily due to a downturn in sigma(omega) at small omega, earlier emphasized by Takenaka et al. as the explanation for bad metal behavior of high-T_c cuprates. We argue, however, that for cuprates strong correlation is the main effect. The data of Takenaka et al. puts theta-ET in a new class of bad metals.

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