1997
DOI: 10.12693/aphyspola.92.597
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Physics of Neutral-to-Ionic Phase Transition in Organic Charge Transfer Semiconducting Compounds

Abstract: An uncommon excitonic instability takes place in some exotic semiconducting compounds. Indeed, the equilibrium neutral-to-ionic (N-I) phase transition, as well as the non-equilibrium photo-induced phase transformation, observed in some organic charge-transfer complexes, originate from intra-and inter-chain cooperative effects between structurally relaxed charge--transfer excitations. This electronic-structural phase transition manifests itself by a change of the degree of charge-transfer and a dimerization dis… Show more

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Cited by 3 publications
(1 citation statement)
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“…The ground state of organic charge-transfer (CT) complexes having alternately stacked electron donor ( D ) and acceptor ( A ) molecules may traverse the neutral−ionic (NI) boundary, when the delicate balance is altered between the effective ionization energy of a D − A pair and the long-range electrostatic energy gain . Although only a very few among a handful CT complexes have been found to thermally experience such an unusual valence transition called the NI transition at ambient pressure, their optical, magnetic, dielectric, and conducting properties have been attracting considerable interest. In particular, upon the transformation to the ionic state, the DA stack carring S = 1 / 2 spins in the constituent molecules shows a spin-Peierls-like dimeric distortion as can be schematized as follows: D 0 A 0 D 0 A 0 D 0 A 0 D 0 A 0 → D + A - D + A - D + A - D + A - .…”
Section: Introductionmentioning
confidence: 99%
“…The ground state of organic charge-transfer (CT) complexes having alternately stacked electron donor ( D ) and acceptor ( A ) molecules may traverse the neutral−ionic (NI) boundary, when the delicate balance is altered between the effective ionization energy of a D − A pair and the long-range electrostatic energy gain . Although only a very few among a handful CT complexes have been found to thermally experience such an unusual valence transition called the NI transition at ambient pressure, their optical, magnetic, dielectric, and conducting properties have been attracting considerable interest. In particular, upon the transformation to the ionic state, the DA stack carring S = 1 / 2 spins in the constituent molecules shows a spin-Peierls-like dimeric distortion as can be schematized as follows: D 0 A 0 D 0 A 0 D 0 A 0 D 0 A 0 → D + A - D + A - D + A - D + A - .…”
Section: Introductionmentioning
confidence: 99%