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2009 ; 10
(2
): 024305
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Organic metal (EDO-TTF)(2)PF(6) with multi-instability
#MMPMID27877278
Yamochi H
; Koshihara SY
Sci Technol Adv Mater
2009[Apr]; 10
(2
): 024305
PMID27877278
show ga
The multi-instability of the electronic structure of (EDO-TTF)(2)PF(6), where
EDO-TTF means ethylene-dioxytetrathiafulvalene, is reviewed. This complex showed
the metal-insulator transition at 280 K associated with distinct molecular
deformations. The mechanism is interpreted as the cooperation of Peierls
transition, charge ordering, and the order-disorder transition of the
countercomponent. The charge ordering pattern in the low-temperature phase is of
the novel [0, 0, 1, 1] type. The sensitivity of the electronic state to external
perturbations is demonstrated applying not only static but also instantaneous
stimuli. In the latter case, the photo-induced phase transition is ultrafast and
highly efficient. One photon causes the transition of several hundreds of donor
molecules in the low-temperature phase to relax into a highly conducting
metastable state within about 1.5 ps. In the early stage of the transient state,
the charge ordering of the [1, 0, 1, 0] type occurs. As for the chemical
modifications of this material, the partial deuteration of this complex increases
the metal-insulator transition temperature. The introduction of a methyl group
greatly modulates the electronic structure of the complex, i.e.
(methyl-EDO-TTF)(2)X (X=BF(4), ClO(4)) shows a two-dimensional electronic
structure. The working hypotheses for developing the systems with
multi-instability are described.
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