ESR Measurements of (DI-DCNQI)<sub>2</sub>Ag Single Crystals

Sakurai, Takahiro; Nakagawa, N.; Okubo, Susumu; Ohta, H.; Kanoda, K.; Hiraki, K.

doi:10.1143/jpsj.70.1794

Cited by 12 publications

(14 citation statements)

References 22 publications

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“…30,31,39,40) The similar enhancement of the ESR linewidth was also reported above the antiferromagnetic transition temperature in (TMTTF) 2 Br and (DI-DCNQI) 2 Ag. [29][30][31]39,41) The absence of the static antiferromagnetic order may be due to the strong fluctuation characteristic of the high one dimensionality in TPP[Co(Pc)(CN) 2 ] 2 . According to Yoshioka et al, the charge disproportionation is theoretically expected to be robust against the fluctuation, as compared with the antiferromagnetic order.…”

Section: Resultssupporting

confidence: 82%

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)₂]₂

et al. 2006

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We investigated the ground state of a highly one-dimensional conductor, TPP[Co(Pc)(CN) 2 ] 2 (TPP = tetraphenylphosphonium and Pc = phthalocyanine), by the measurement of the X-ray diffraction, electron spin resonance, nuclear quadrupole resonance, and magnetoresistance. An increase of the magnetic fluctuations was observed below 20 K, where no structural deformation was detected. In the 59 Co nuclear quadrupole resonance, we found an asymmetric broadening of the spectra owing to the intrinsic inhomogeneity of the molecular charge. We propose that the ground state is characterized by a weak charge disproportionation with antiferromagnetic fluctuations due to the high one dimensionality. A large magnetoresistance was observed under a high magnetic field. Spin effects are dominant at low fields. The anisotropic magnetoresistance suggests a change in the ground-state nature above 10 T.

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Section: Resultssupporting

confidence: 82%

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)₂]₂

et al. 2006

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“…5 and 6, respectively. The physical behavior of the pristine salt quantitatively agreed with previously reported one [32][33][34][35][36][37][38][39][40][41][42][43]. Ag(DI) 2 exhibited semiconducting behavior, i.e.…”

Section: Photochemical Control Of Electrical and Magnetic Propertiessupporting

confidence: 87%

“…All Ag(DX) 2 (X = Cl, Br, I) are known to be isomorphous [22,23,[32][33][34][35][36][37][38][39][40][41][42] from X-ray measurements of their lattice parameters, yet their full structural analyses (atomic parameters) have not been reported.…”

Section: Crystal Structures Of Pristine Ag(dx)mentioning

confidence: 99%

Photochemical modification of magnetic properties in organic low-dimensional conductors

Naito

Kakizaki

Wakeshima

et al. 2009

Journal of Solid State Chemistry

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Magnetic properties of organic charge transfer salts Ag(DX) 2 (DX = 2,5-dihalogeno-N,N'-dicyanoquinonediimine; X = Cl, Br, I) were modified by UV irradiation from paramagnetism to diamagnetism in an irreversible way. The temperature dependence of susceptibility revealed that such change in magnetic behavior could be continuously controlled by the duration of irradiation. The observation with scanning electron microprobe revealed that the original appearance of samples, e.g. black well-defined needle-shaped shiny single crystals, remained after irradiation irrespective of the irradiation conditions and the duration. Thermochemical analysis and X-ray diffraction study demonstrated that the change in the physical properties were due to (partial) decomposition of Ag(DX) 2 to AgX, which was incorporated in the original Ag(DX) 2 lattices. Because the physical properties of  Corresponding author: tnaito@sci.hokudai.ac.jp 2 low-dimensional organic conductors are very sensitive to lattice defects, even a small amount of AgX could effectively modify the electronic properties of Ag(DX) 2 without making the original crystalline appearance collapse.

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“…These phenomena were regarded as characteristic of a one-dimensional system in which the Peierls instability plays an important and intrinsic role, although electron correlation also affects their ground states. By contrast, DI-DCNQI 2 Ag is insulating even at room temperature and exhibits an antiferromagnetic order at 5.5 K [5,8,9]. Below 220 K, Ref.…”

mentioning

confidence: 94%

Wigner Crystallization in(DI−DCNQI)2AgDetected by Synchrotron Radiation X-Ray Diffraction

et al. 2007

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The low-temperature electronic structure of the quarter-filled, quasi-one-dimensional (Q1D) system (DI-DCNQI)2Ag is revealed using synchrotron radiation x-ray diffraction. In spite of the interchain frustration in the twofold superstructure along the 1D chain, the body-centered tetragonal "charge ordering" structure, which consists of 4k_{F} charge ordering columns and 4k_{F} bond order wave columns, is realized. This is the first example of the Q1D system having plural kinds of columns as its ground state. This charge ordered structure is regarded as a Wigner crystal caused by intercolumn Coulomb repulsion.

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ESR Measurements of (DI-DCNQI)₂Ag Single Crystals

Cited by 12 publications

References 22 publications

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)₂]₂

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)₂]₂

Photochemical modification of magnetic properties in organic low-dimensional conductors

Wigner Crystallization in(DI−DCNQI)2AgDetected by Synchrotron Radiation X-Ray Diffraction

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ESR Measurements of (DI-DCNQI)2Ag Single Crystals

Cited by 12 publications

References 22 publications

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)2]2

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)2]2

Photochemical modification of magnetic properties in organic low-dimensional conductors

Wigner Crystallization in(DI−DCNQI)2AgDetected by Synchrotron Radiation X-Ray Diffraction

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ESR Measurements of (DI-DCNQI)₂Ag Single Crystals

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)₂]₂

Charge Disproportionation in Highly One-Dimensional Molecular Conductor TPP[Co(Pc)(CN)₂]₂