Conduction-electron-spin resonance in organic conductors:<i>α</i>and<i>β</i>phases of di[bis(ethylenedithiolo)tetrathiafulvalene]triiodide [(BEDT-TTF<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">I</mml:mi></mml:mrow><mm

Sugano, Tadashi; Saito, Gunzi; Kinoshita, Minoru

doi:10.1103/physrevb.34.117

Cited by 109 publications

(52 citation statements)

References 26 publications

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“…7(b). However, in contrast to (TMTTF)2X where the spins are intact at the transition, the CO transition in -I3 is accompanied by a concomitant spinsinglet formation as a consequence of the strong dimerization [1,3,17,18,20,30,31].…”

Section: Discussionmentioning

confidence: 80%

“…However, the presence of the low-energy linear spectrum near EF is hidden at low T beneath the first-order chargeordering (CO) transition taking place at TCO ≈ 135K [1,3,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] due to strong electron correlations [28,29]. The transition is accompanied by an opening of an energy gap in the charge and spin excitation spectra and a formation of quasi-one-dimensional (quasi-1D) charge stripes along the crystalline b axis [14], leading to an insulating spin-singlet ground state [1,3,17,18,20,30,31]. The inversion centers, locating on the molecules B and C and in between the molecules A and A' at T > TCO [ Fig.…”

Section: Introductionmentioning

confidence: 99%

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Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed via
Ishikawa
¹
,
Hirata
²
,
Liu
³

et al. 2016
Phys. Rev. B

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed via
Ishikawa
¹
,
Hirata
²
,
Liu
³

et al. 2016
Phys. Rev. B

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“…8,16) As temperature decreases, the susceptibility gradually falls off toward T CO and then abruptly drops at T CO , showing a nonmagnetic behavior. [16][17][18][19] In addition to these features, a frequency-dependent conductivity is found in the chargeordered state in a wide frequency range above 12 GHz. 20) 0 -IBr 2 also has two types of stacks, but the symmetries of the molecule arrangements are different from those of -I 3 .…”

Section: Introductionmentioning

confidence: 95%

Charge Transport in Charge-Ordered States of Two-Dimensional Organic Conductors, α-(BEDT-TTF)₂I₃ and α'-(BEDT-TTF)₂IBr₂

et al. 2012

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Electric conductance and dielectric constant have been measured in the charge-ordered states of the quasi twodimensional organic conductors -(BEDT-TTF) 2 I 3 and 0 -(BEDT-TTF) 2 IBr 2 to understand the charge transport mechanism. The current-voltage (I-V ) characteristics show a strong nonlinear behavior, which is qualitatively explained by the transport of individual carriers thermally excited from the charge-ordered states in BEDT-TTF layers. The discrepancy with the simulation based on the thermal activation model at low temperatures is likely due to quantum tunneling through the potential barrier. The dielectric constants show a large difference between the in-plane and out-of-plane directions of the samples, showing a highly two-dimensional nature of Coulomb potential. The temperature dependence of dielectric constant is ascribed to the polarization effect of the thermally excited electronhole pairs, consistent with the model of nonlinear I-V characteristics. All these features are qualitatively the same between -(BEDT-TTF) 2 I 3 and 0 -(BEDT-TTF) 2 IBr 2 , despite the different structural and magnetic properties.

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“…The magnetic parameters of the radicals, g-tensors and inhomogeneous line widths, have been taken from CW-EPR data on [3-carotene and tetrathiafulvalene radical cations [42,43,47,48] and on fulleropyrrolidine and porphyrin radical anions [44, 45, 49, 50,] anda fine adjustment of the experimental values has produced the best-fit simulations of the radical pair spectra shown in Fig. 5.…”

Section: Spectral Analysis Of the Spin-correlated Radical Pairmentioning

confidence: 99%

EPR-detected photoinduced electron transfer in three structurally related molecular triads

et al. 2006

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A comparative electron paramagnetic resonance (EPR) study has been performed on a series of structurally related molecular triads which undergo photoinduced electron transfer and differ one from the other in terms of the acceptor or donor moieties. The molecular triads, C-P-C6o , TTF-P-C6o and C-P-PF, share the same free-base tetraarylporphyrin (P) as the primary electron donor, which after light excitation initiates the electron transfer process, but differ either in terms of the electron acceptor (fullerene derivative, C6o , versus fluorinated free-base porphyrin, PF), or in terms of the final electron donor (carotenoid polyene, C, versus tetrathiafulvalene, TTF). AII these molecular triads can be considered artificial photosynthetic reaction centers in their ability to mimic several key properties of the reaction center primary photochemistry. Photoinduced charge separation and recombination have been followed by time-resolved EPR in a glass of 2-methyltetrahydrofuran and in the nematic phase of the uniaxial liquid crystal E-7. All the triads undergo photoinduced electron transfer, with the generation of charge-separated states in both the low-dielectric environment of the 2-methyltetrahydrofuran glass and in anisotropic E-7 medium. Different photochemical pathways have been recognized depending on the specific donor and acceptor moieties constituting the molecular triads. In the presence of the tetrathiafulvalene electron donor singlet-and triplet-initiated electron transfer routes are concurrently active. Recombination to the low-lying carotenoid triplet state occurs in the carotene-based triads, while singlet recombination is the only active route for the TTF-P-C6o triad, where a low-lying triplet state is lacking. Long-lived charge separation has been observed in the case of TTF-P-C6o: about 8 p.s for the singlet-born radical pair in the glassy isotropic matrix and about 7 ~ts for the triplet-born radical pair in the nematic phase of E-7. For all the molecular triads, a weak exchange interaction (J ~ I G) between the electrons in the final spin-correlated radical pair has been evaluated by simulation of the EPR spectra, providing evidence for superexchange electronic interactions mediated by the tetraarylporphyrin bridge.

show abstract

Conduction-electron-spin resonance in organic conductors:αandβphases of di[bis(ethylenedithiolo)tetrathiafulvalene]triiodide [(BEDT-TTF)2I

Cited by 109 publications

References 26 publications

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed via
Ishikawa
¹
,
Hirata
²
,
Liu
³

et al. 2016
Phys. Rev. B

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed via
Ishikawa
¹
,
Hirata
²
,
Liu
³

et al. 2016
Phys. Rev. B

Charge Transport in Charge-Ordered States of Two-Dimensional Organic Conductors, α-(BEDT-TTF)₂I₃ and α'-(BEDT-TTF)₂IBr₂

EPR-detected photoinduced electron transfer in three structurally related molecular triads

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Conduction-electron-spin resonance in organic conductors:αandβphases of di[bis(ethylenedithiolo)tetrathiafulvalene]triiodide [(BEDT-TTF)2I

Cited by 109 publications

References 26 publications

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed viaIshikawa1, Hirata2, Liu3 et al. 2016Phys. Rev. B

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed viaIshikawa1, Hirata2, Liu3 et al. 2016Phys. Rev. B

Charge Transport in Charge-Ordered States of Two-Dimensional Organic Conductors, α-(BEDT-TTF)2I3 and α'-(BEDT-TTF)2IBr2

EPR-detected photoinduced electron transfer in three structurally related molecular triads

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Product

Resources

About

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed via
Ishikawa
¹
,
Hirata
²
,
Liu
³

et al. 2016
Phys. Rev. B

Spin excitations in the quasi-two-dimensional charge-ordered insulatorα−(BEDT−TTF)2I3probed via
Ishikawa
¹
,
Hirata
²
,
Liu
³

et al. 2016
Phys. Rev. B

Charge Transport in Charge-Ordered States of Two-Dimensional Organic Conductors, α-(BEDT-TTF)₂I₃ and α'-(BEDT-TTF)₂IBr₂