TY - JOUR
T1 - Collapse of coherent quasiparticle states in θ-(BEDT-TTF)2I3 observed by optical spectroscopy
AU - Takenaka, K.
AU - Tamura, M.
AU - Tajima, N.
AU - Takagi, H.
AU - Nohara, J.
AU - Sugai, S.
PY - 2005/11/25
Y1 - 2005/11/25
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=28844466826&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.95.227801
DO - 10.1103/PhysRevLett.95.227801
M3 - Article
C2 - 16384266
AN - SCOPUS:28844466826
SN - 0031-9007
VL - 95
JO - Physical review letters
JF - Physical review letters
IS - 22
M1 - 227801
ER -