A new organic superconductor β-(meso-DMBEDT-TTF)<sub>2</sub>PF<sub>6</sub>

Kimura, Shinya; Maejima, Tomoko; Suzuki, Hideaki; Chiba, Ryoma; Mori, H.; Kawamoto, Tadashi; Mori, Toshiyuki; Moriyama, Hiroshi; Nishio, Y.; Kajita, Kôji

doi:10.1039/b409631b

Cited by 45 publications

(55 citation statements)

References 16 publications

(4 reference statements)

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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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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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“…Among the CT salts based on BEDT-TTF derivatives, the complex β-(meso-DMBEDT-TTF) 2 PF 6 with 3/4-filled band structure shows relatively weak metallic behavior from room temperature to 75 K and at an ambient pressure ( Figure 1, [4,7]). The distinct metal-insulator transition occurs at 75 K, where the checkerboard-type charge ordering (CO) appears by accompanying the lattice distortion [5,6].…”

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

confidence: 99%

“…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%

“…The relation between the CO and the superconductivity is also under question. In order to clarify the origin of the checkerboard-type CO and its relation to the superconductivity, the preparation, the crystal structure analysis at 30 K, and the electrical and the magnetic properties of β-(meso-DMBEDT-TTF) 2 AsF 6 were investigated in addition to the PF 6 complex [3][4][5][6][7][8][9]. [4,6,7].…”

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

confidence: 99%

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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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“…The syntheses of the corresponding dimethyl-substituted derivatives of BEDT-TTF, for which three kinds of stereoisomers, that is, a meso (or cis)-form ( Figure 25) and an enantiomeric pair of (R,R)-and (S,S)-forms are possible, have been previously reported [48,49] …”

Section: Meso-dmdh-ttp Saltsmentioning

confidence: 86%

Chemical Modifications of BDH-TTP [2,5-Bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene]: Control of Electron Correlation

Yamada

Akutsu

2012

Crystals

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Organic molecular conductors with a strongly correlated electron system, in which the itinerancy of electrons (or holes) and the electron correlation (U/W, U, the on-site Coulomb repulsion, W, the bandwidth) compete with each other, are promising candidates for achieving superconductivity and also for exploring remarkable physical properties induced by external stimuli such as pressure, light, voltage and current. Our synthetic approach to the construction of strongly correlated organic electron systems is based on chemical modifications to the donor molecule BDH-TTP [2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene] capable of producing metallic CT (charge-transfer) salts stable down to low temperatures (4.2-1.5 K). This aims at enhancing the electron correlation in the itinerant electron system by decreasing the bandwidth. Chemical modifications of BDH-TTP such as ring expansion of two outer dithiolane rings, replacement of one sulfur atom in an outer dithiolane ring with an oxygen atom and introduction of two methyl substituents into an outer ditiolane ring led to BDA-TTP [2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene], DHOT-TTP [2-(1,3-dithiolan-2-ylidene)-5-(1,3-oxathiolan-2-ylidene)-1,3,4,6-tetrathiapentalene] and DMDH-TTP [2-(4,5-dimethyl-1,3-dithiolan-2-ylidene)-5-(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene], respectively. In this review, the physical properties and the crystal and electronic structures of molecular conductors derived from these donor molecules will be described. OPEN ACCESSCrystals 2012, 2 813

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A new organic superconductor β-(meso-DMBEDT-TTF)₂PF₆

Cited by 45 publications

References 16 publications

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

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

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

Chemical Modifications of BDH-TTP [2,5-Bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene]: Control of Electron Correlation

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A new organic superconductor β-(meso-DMBEDT-TTF)2PF6

Cited by 45 publications

References 16 publications

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

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

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

Chemical Modifications of BDH-TTP [2,5-Bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene]: Control of Electron Correlation

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A new organic superconductor β-(meso-DMBEDT-TTF)₂PF₆