Wigner Crystal Type of Charge Ordering in an Organic Conductor with a Quarter-Filled Band:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi>DI</mml:mi><mml:mi>−</mml:mi><mml:mi>DCNQI</mml:mi><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:mi>Ag</mml:mi></mml:math>

Hiraki, K.; Kanoda, K.

doi:10.1103/physrevlett.80.4737

Cited by 168 publications

(111 citation statements)

References 16 publications

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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: 78%

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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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Section: Photochemical Control Of Electrical and Magnetic Propertiessupporting

confidence: 78%

“…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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“…On the other hand, a charge modulation can be induced by electronic Peierls instability, the so called charge density wave (CDW) 4,5 . As electron states are localized as in the Mott states, it appears as a charge order-type modulation due to intersite Coulomb interactions [6][7][8] .…”

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confidence: 99%

Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Lee

Kim

et al. 2015

Nat Commun

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Spin-orbit coupling results in technologically-crucial phenomena underlying magnetic devices like magnetic memories and energy-efficient motors. In heavy element materials, the strength of spin-orbit coupling becomes large to affect the overall electronic nature and induces novel states such as topological insulators and spin-orbit-integrated Mott states. Here we report an unprecedented charge-ordering cascade in IrTe 2 without the loss of metallicity, which involves localized spin-orbit Mott states with diamagnetic Ir 4 þ -Ir 4 þ dimers. The cascade in cooling, uncompensated in heating, consists of first order-type consecutive transitions from a pure Ir 3 þ phase to Ir 3 þ -Ir 4 þ charge-ordered phases, which originate from Ir 5d to Te 5p charge transfer involving anionic polymeric bond breaking. Considering that the system exhibits superconductivity with suppression of the charge order by doping, analogously to cuprates, these results provide a new electronic paradigm of localized charge-ordered states interacting with itinerant electrons through large spin-orbit coupling.

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“…NMR allows to identify the very fact of the CO via nonequivalence of molecular sites [4,8] but it cannot distinguish between the q = 0 state and the known undulating ones (either along the stack like the 4k F (Wigner) condensation in (DCNQI) 2 Ag [8] or between stacks like in (T MT T F ) 2 SCN) [2]). So, the identification of the nature of this " structureless" q = 0 transition was still unsolved.…”

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confidence: 99%

Ferroelectric Mott-Hubbard Phase of Organic(TMTTF)2XConductors

2001

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We present experimental evidences for a ferro-electric transition in the family of quasi-one-dimensional conductors (T M T T F ) 2 X. We interpret this new transition in the frame of the combined Mott-Hubbard state taking into account the double action of the spontaneous charge disproportionation on the T M T T F molecular stacks and of the X anionic potentials.PACS numbers: 71.30 +h, 7127 +a, 77.80.Bh, 7145.Lr Low dimensional electronic systems serve as a workshop on problems of strong correlations. The richest opportunities have been opened by the family of charge transfer salts M 2 X formed of stacks of organic molecules tetramethyltetrathiofulvalene (M = T MT T F ) or tetramethyltetraselenafulvalene (M = T MT SF ) with anions X = P F 6 , AsF 6 , SbF 6 , SCN, etc as counterions. The ions sit in loose cavities delimited by the methyl groups of the organic molecules. These materials show almost all known electronic phases: a metal, a paramagnetic insulator (PI), spin/charge density waves (SDW/CDW), the spin-Peierls state and finally the superconducting state [1]. In parallel, there is a set of several different structural types due to anion ordering (AO) which are slight arrangements in X chains [2]. Their tran-1 sition temperatures T a ≈ 100 − 200K are much higher than that corresponding to electronic transitions occurring in the range of T c ≈ 1 − 10K.Very recently, in the already very rich phase diagram of these salts, a new phase transition has been discovered, being revealed by a huge anomaly in the low frequency dielectric constant ǫ ′ at T 0 = 70K in (T MT T F ) 2 P F 6 and at 100K in (T MT T F ) 2 AsF 6 [3]. Very soon NMR studies have proved [4] that the transitions at T 0 are related to charge disproportionation, also called charge ordering (CO), dividing molecules within in two non equivalent species. Previous reports on T MT T F salts with larger anions such as SbF 6 have suggested the occurrence of a phase transition, sometimes called " structureless" transition, . So, the identification of the nature of this " structureless" q = 0 transition was still unsolved. We show hereafter that ǫ ′ in (T MT T F ) 2 SbF 6 , as in the case of (T MT T F ) 2 P F 6 and (T MT T F ) 2 AsF 6 , exhibits a huge divergence at 154K. Dielectric experiments are providing thus an unique access to the anomalous collective properties of this mysterious transition identifying the resulting state as a never expected ferroelectric (FE) one.In the high temperature range T > T a , T 0 the counterions already have a profound effect on the electronic properties: the anions dimerize the intermolecular spacing of the TMTTF molecules along the stacks. As a result, the conduction band is split into a filled lower band separa ted from a half-filled upper band by a dimerization gap, leading to Mott-Hubbard charge localization. The effects brought by the AOs with q = 0 have been previously discussed ( [2,9] and refs. therein). The new effects of combined CO-AO with q = 0 are 2 the main topic of the present work. Empirically one ...

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Wigner Crystal Type of Charge Ordering in an Organic Conductor with a Quarter-Filled Band:(DI−DCNQI)2Ag

Cited by 168 publications

References 16 publications

Photochemical modification of magnetic properties in organic low-dimensional conductors

Photochemical modification of magnetic properties in organic low-dimensional conductors

Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Ferroelectric Mott-Hubbard Phase of Organic(TMTTF)2XConductors

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