Charge-Density-Wave State within Pd(dmit)_2 Layer in Two-Dimensional Molecular Conductor (IEDT)[Pd(dmit)_2]
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概要
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We measured optical reflectance, Raman spectra, magnetic susceptibility, and electron paramagnetic resonance for the molecular conductor (IEDT)[Pd(dmit)_2]. The excitation from the bonding molecular orbital to the antibonding orbital in the Pd(dmit)_2 dimer causes a strtking peak in the optical spectra around 11000 cm^<-1>. By analyzing the spectral intensity for this peak, we determined the degree of the charge transfer from the IEDT molecule to the Pd(dmit)_2 molecule. A gap structure appears below 2000 ^<-1> in the reflectance spectra below 100 K. The magnetic susceptibility decreases around 100 K. These phenomena suggest a reduction in the density of states The electron paramagnetic resonance measurement reveals that the g_<b-> value decreases around 80K. This is due to a reduction in the paramagnetic contribution of the Pd(dmit)_2 layer. The Ag modes of the Pd(dmit)_2 molecule become infrared-active below 100 K as a result of the broken symmetry in the Pd(dmit)_2 layer. We propose that the resistance anomaly around 80 K originates from the charge density wave formation within the Pd(dmit)_2 layer.
- 社団法人日本物理学会の論文
- 2003-09-15
著者
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Kato R
Riken (the Institute Of Physical And Chemical Research) Jst-crest
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TAJIMA H.
Institute for Solid State Physics, University of Tokyo
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HANASAKI N.
(Present address) Department of Applied, University of Tokyo
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HANASAKI N.
Institute for Solid State Physics, University of Tokyo
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Kato Reizo
Condensed Molecular Materials Lab. Riken
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IMAKUBO Tasturo
RIKEN
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Hanasaki N.
(present Address) Department Of Applied University Of Tokyo
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IMAKUBO T.
RIKEN (Institute of Physical and Chemical Research)
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KATO R.
RIKEN (Institute of Physical and Chemical Research)
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Kato Reizo
Condensed Molecular Materials Lab., RIKEN
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Hanasaki N.
Department of Physics, Okayama University:Institute for Solid State Physics, University of Tokyo
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