TY - JOUR
T1 - Anomalous dielectric response in the dimer Mott insulator κ- (BEDT-TTF )2Cu2(CN )3
AU - Abdel-Jawad, Majed
AU - Terasaki, Ichiro
AU - Sasaki, Takahiko
AU - Yoneyama, Naoki
AU - Kobayashi, Norio
AU - Uesu, Yoshiaki
AU - Hotta, Chisa
PY - 2010/9/21
Y1 - 2010/9/21
N2 - We have measured and analyzed the dielectric constant of the dimer Mott insulator κ- (BEDT-TTF)2Cu2(CN)3, which is known as a playground for a spin-liquid state. Most unexpectedly, this particular organic salt has nontrivial charge degrees of freedom, being characterized by a relaxor-like dielectric relaxation below around 60 K. This is ascribed to the charge disproportionation within the dimer due to the intersite Coulomb repulsion. A possible microscopic model is suggested and discussed.
AB - We have measured and analyzed the dielectric constant of the dimer Mott insulator κ- (BEDT-TTF)2Cu2(CN)3, which is known as a playground for a spin-liquid state. Most unexpectedly, this particular organic salt has nontrivial charge degrees of freedom, being characterized by a relaxor-like dielectric relaxation below around 60 K. This is ascribed to the charge disproportionation within the dimer due to the intersite Coulomb repulsion. A possible microscopic model is suggested and discussed.
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U2 - 10.1103/PhysRevB.82.125119
DO - 10.1103/PhysRevB.82.125119
M3 - Article
AN - SCOPUS:77957742068
SN - 1098-0121
VL - 82
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 12
M1 - 125119
ER -