TY - JOUR
T1 - Highly nonlinear current-voltage characteristics of the organic Mott insulator κ-(BEDT-TTF)2Cu[N(CN)2]Cl
AU - Takahide, Yamaguchi
AU - Kimata, Motoi
AU - Kodama, Kouta
AU - Terashima, Taichi
AU - Uji, Shinya
AU - Kobayashi, Megumi
AU - Yamamoto, Hiroshi M.
PY - 2011/7/11
Y1 - 2011/7/11
N2 - The organic Mott insulator κ-(BEDT-TTF)2Cu[N(CN) 2]Cl exhibits highly nonlinear current-voltage characteristics in a low current range at temperatures below 10 K. The nonlinear current-voltage characteristics are similar to those observed in the charge-ordered organic crystals θ-(BEDT-TTF)2MZn(SCN)4 (M=Cs and Rb) and are accounted for in the same way in terms of exciton excitations: The electric field assists the thermal unbinding of pairs of a doublon and a holon that attract each other due to the two-dimensional long-range Coulomb interaction. Dielectric properties are understood within the context of the same model in terms of polarization of the bound pairs. κ-(BEDT-TTF)2Cu[N(CN) 2]Cl has a smaller magnetoconductance than θ-(BEDT-TTF) 2MZn(SCN)4 (M=Cs and Rb), which probably reflects different spin states of the excitations for the Mott and charge-ordered states.
AB - The organic Mott insulator κ-(BEDT-TTF)2Cu[N(CN) 2]Cl exhibits highly nonlinear current-voltage characteristics in a low current range at temperatures below 10 K. The nonlinear current-voltage characteristics are similar to those observed in the charge-ordered organic crystals θ-(BEDT-TTF)2MZn(SCN)4 (M=Cs and Rb) and are accounted for in the same way in terms of exciton excitations: The electric field assists the thermal unbinding of pairs of a doublon and a holon that attract each other due to the two-dimensional long-range Coulomb interaction. Dielectric properties are understood within the context of the same model in terms of polarization of the bound pairs. κ-(BEDT-TTF)2Cu[N(CN) 2]Cl has a smaller magnetoconductance than θ-(BEDT-TTF) 2MZn(SCN)4 (M=Cs and Rb), which probably reflects different spin states of the excitations for the Mott and charge-ordered states.
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U2 - 10.1103/PhysRevB.84.035129
DO - 10.1103/PhysRevB.84.035129
M3 - Article
AN - SCOPUS:79961232594
SN - 0163-1829
VL - 84
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 3
M1 - 035129
ER -