Checkerboard-Type Charge-Ordered State of a Pressure-Induced Superconductor, β-(meso-DMBEDT-TTF)2PF6

Kimura, Shinya; Suzuki, Hideaki; Maejima, Tomoko; Mori, H.; Yamaura, Jun‐ichi; Kakiuchi, T.; Sawa, Hiroshi; Moriyama, Hiroshi

doi:10.1021/ja057307o

Cited by 60 publications

(54 citation statements)

References 12 publications

(12 reference statements)

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“…We further note that the charge order is known to be vulnerable to impurities [46], while the charge density wave is more or less robust against impurities [47]. A similar type of the phase transition occurs in the organic salt β-(meso-DMBEDT-TTF) 2 PF 6 [48]. Many conductive organic salts with a chemical formula of A 2 B consists of a dimer molecule of A 2 as a composition unit.…”

Section: And κ-(Bedt-ttf)cu[n(cn)mentioning

confidence: 65%

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3

et al. 2016

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Abstract:We have prepared polycrystalline samples of the trimer Ir oxide BaIrO 3 with face-shared Ir 3 O 12 trimers, and have investigated the origin of the phase transition at 182 K by measuring resistivity, thermopower, magnetization and synchrotron X-ray diffraction. We propose a possible electronic model and transition mechanism, starting from a localized electron picture on the basis of the Rietveld refinement. Within this model, BaIrO 3 can be basically regarded as a Mott insulator, when the Ir 3 O 12 trimer is identified to one pseudo-atom or one lattice site. The transition can be viewed as a transition from the Mott insulator phase to a kind of charge ordered insulator phase.

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Section: And κ-(Bedt-ttf)cu[n(cn)mentioning

confidence: 65%

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3

et al. 2016

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“…The distinct metal-insulator transition occurs at 75 K, where the checkerboard-type charge ordering (CO) appears by accompanying the lattice distortion [5,6]. The charge disproportionation was also confirmed to be D [D = meso-DMBEDT-TTF] by IR and Raman spectroscopy [9].…”

Section: Most Molecular Charge Transfer (Ct) Complexes Have [(Donor) 2 ]mentioning

confidence: 96%

“…In order to obtain a variety of electronic states, the correlation parameters have been changed systematically by modifying the BEDT-TTF molecule. As a result, BEDT-TTF derivatives and their charge transfer complexes have been synthesized and prepared, and their physical properties have been investigated [3][4][5][6][7][8][9].…”

Section: Most Molecular Charge Transfer (Ct) Complexes Have [(Donor) 2 ]mentioning

confidence: 99%

Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6)

et al. 2012

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Abstract:The metallic state of the molecular conductor β-(meso-DMBEDT-TTF) 2 X (DMBEDT-TTF = 2- (5,6-dihydro-1,3-dithiolo[4,5-b][1,4]dithiin-2-ylidene) -5,6-dihydro-5,6-dimethyl-1,3-dithiolo[4,5-b][1,4]dithiin, X = PF 6 , AsF 6 ) is transformed into the checkerboard-type charge-ordered state at around 75-80 K with accompanying metalinsulator (MI) transition on the anisotropic triangular lattice. With lowering temperatures, the magnetic susceptibility decreases gradually and reveals a sudden drop at the MI OPEN ACCESSCrystals 2012, 2 1503 transition. By applying pressure, the charge-ordered state is suppressed and superconductivity appears in β-(meso-DMBEDT-TTF) 2 AsF 6 as well as in the reported β-(meso-DMBEDT-TTF) 2 PF 6 . The charge-ordered spin-gapped state and the pressure-induced superconducting state are discussed through the paired-electron crystal (PEC) model, where the spin-bonded electron pairs stay and become mobile in the crystal, namely the valence-bond solid (VBS) and the resonant valence bonded (RVB) state in the quarter-filled band structure.

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“…(iii) β-(meso-DMET) 2 PF 6 : This 2D CTS exhibits a pressure-induced transition from CO to SC 74,75 . While the charge order pattern in this CTS is referred to as "checkerboard" by the authors, the checkerboard pattern refers to meso-DMET dimers as units.…”

Section: Cts With Pec Insulating Statesmentioning

confidence: 99%

Paired electron crystal: Order from frustration in the quarter-filled band

et al. 2011

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We present a study of the effects of simultaneous charge-and spin-frustration on the twodimensional strongly correlated quarter-filled band on an anisotropic triangular lattice. Our conclusions are based on exact diagonalization studies that include electron-electron interactions as well as adiabatic electron-phonon coupling terms treated self-consistently. The broken-symmetry states that dominate in the weakly frustrated region near the rectangular lattice limit are the well known antiferromagnetic state with in-phase lattice dimerization along one direction, and the Wigner crystal state with the checkerboard charge order. For moderate to strong frustration, however, the dominant phase is a novel spin-singlet paired-electron crystal (PEC), consisting of pairs of charge-rich sites separated by pairs of charge-poor sites. The PEC, with coexisting charge-order and spin-gap in two dimension, is the quarter-filled band equivalent of the valence bond solid (VBS) that can appear in the frustrated half-filled band within antiferromagnetic spin Hamiltonians. We discuss the phase diagram as a function of on-site and intersite Coulomb interactions as well as electronphonon coupling strength. We speculate that the spin-bonded pairs of the PEC can become mobile for even stronger frustration, giving rise to a paired-electron liquid. We discuss the implications of the PEC concept for understanding several classes of quarter-filled band materials that display unconventional superconductivity, focusing in particular on organic charge transfer solids. Our work points out the need to go beyond quantum spin liquid (QSL) concepts for highly frustrated organic charge-transfer solids such as κ-(BEDT-TTF)2Cu2(CN)3 and EtMe3Sb[Pd(dmit)2]2, which we believe show frustration-induced charge disproportionation at low temperatures. We discuss possible application to layered cobaltates and 1 4 -filled band spinels.

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Checkerboard-Type Charge-Ordered State of a Pressure-Induced Superconductor, β-(meso-DMBEDT-TTF)₂PF₆

Cited by 60 publications

References 12 publications

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3

Novel Charge Ordering in the Trimer Iridium Oxide BaIrO3

Magnetism and Pressure-Induced Superconductivity of Checkerboard-Type Charge-Ordered Molecular Conductor β-(meso-DMBEDT-TTF)2X (X = PF6 and AsF6)

Paired electron crystal: Order from frustration in the quarter-filled band

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