Structural aspects of the ambient-pressure BEDT-TTF superconductors

Yamochi, Hideki; Komatsu, Tokutaro; Matsukawa, Nozomu; Saito, Gunzi; Mori, Takehiko; Kusunoki, Masami; Sakaguchi, K.

doi:10.1021/ja00077a034

Cited by 118 publications

(44 citation statements)

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“…42 The different spatial key-keyhole pattern in 2 compared with 1 is not ascribed to the coordination geometry of Ag Figure S8). This unique key-on-rim geometry observed in 2 has been reported in ¬-(EDS-EDT-TTF) 2 Ag 2 (CN) 3 (· 300 K = 3.0 © 10 ¹4 S cm ¹1 , ¾ a = 120 meV) where EDS-EDT-TTF is shown in Scheme 1.…”

Section: ¹1mentioning

confidence: 99%

Design and Preparation of a Quantum Spin Liquid Candidate κ-(ET)2Ag2(CN)3 Having a Nearby Superconductivity

Hiramatsu

Yoshida

Saito

et al. 2017

Bulletin of the Chemical Society of Japan

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medal with purple ribbon awarded by the Government of Japan (2009). He has been devoted to the development of molecular compounds with π-systems bearing exotic functionality. AbstractSimilar to the first quantum spin liquid (QSL) candidate, ¬-(ET) 2 Cu 2 (CN) 3 (1), newly prepared ¬-(ET) 2 Ag 2 (CN) 3 (2) is a dimer Mott insulator with a QSL ground state at ambient pressure and exhibits metallic and superconducting states next to the QSL state under pressure, where ET is bis(ethylenedithio)tetrathiafulvalene. The packing of the ET dimer, which corresponds to a single spin site (S = 1/2), in 2 is similar to that in 1. Salt 2 afforded a two-dimensional equilateral triangular spin lattice having strong geometrical spin frustration (t¤/t = 0.967) similar to 1 (t¤/t = 1.09), where t and t¤ are the interdimer transfer interactions. The geometric relationship between the spin site and the opening in the anion layer in 2 is considerably different from that in 1, resulting in more dispersed packing of ET dimers, narrower bandwidth W, and larger on-site Coulomb repulsion energy U for 2 than 1. As a consequence, 2 has a higher electron correlation U/W, more robust QSL state for wider pressure range and is allocated far away from the itinerant region compared to those of 1. The narrower bandwidth is consistent with a higher superconducting critical temperature for 2 than 1 under pressure.

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Section: ¹1mentioning

confidence: 99%

Design and Preparation of a Quantum Spin Liquid Candidate κ-(ET)2Ag2(CN)3 Having a Nearby Superconductivity

Hiramatsu

Yoshida

Saito

et al. 2017

Bulletin of the Chemical Society of Japan

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“…62 The deformation of the anion network should be transmitted to the BEDT-TTF molecules via their terminal ethylene groups. In particular, the crystal structure reveals 63 that one of the hydrogen atoms of each ethylene group is located in a cavity formed by the anion sublattice. These atoms have thus very close contacts with the anion layer.…”

Section: B Nature Of the Modulation Probed By The X-ray Scatteringmentioning

confidence: 99%

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4
Foury-Leylekian
¹
,
Pouget
²
,
Lee
³

et al. 2010
Phys. Rev. B
27
3
34
0
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“…It has also been pointed out that an increase of 3D character through an insulating anion layer results in higher T c in BEDT-TTF superconductors [145,146]. However, a 3D Fermi surface has not yet been observed in solids based exclusively on organic molecules, but it has been theoretically suggested by a tight-binding band calculation in a metal dithiolene system, Me x H 4−x N[Pd(dmise) 2 ] 2 (x = 2, 3) [147].…”

Section: Radical Cation Salts Based On (Thio)pyran Analogsmentioning

confidence: 99%

Tetrathiapentalene-based organic conductors

Misaki

2009

Science and Technology of Advanced Materials

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The synthesis, structure and properties of tetrathiapentalene-based (TTP) organic conductors are reviewed. Among various TTP-type donors, bis-fused tetrathiafulvalene, 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene (BDT-TTP) and its derivatives afford many metallic radical cation salts stable down to low temperatures, regardless of the size and shape of the counter anions. Most BDT-TTP conductors have a β-type donor arrangement with almost uniform stacks. Introduction of appropriate substituents results in molecular packing that differs from the β-type. A vinylogous TTP, 2-(1,3-dithiol-2-ylidene)-5-(2-ethanediylidene-1,3-dithiole)-1,3,4,6-tetrathiapentalene (DTEDT) has yielded an organic superconductor (DTEDT) 3 Au(CN) 2 as well as metallic radical cation salts, regardless of the counter anions. (Thio)pyran analogs of TTP, namely (T)PDT-TTP and its derivatives produce molecular conductors with novel molecular arrangements. A TTP analog with reduced π-electron system 2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene (BDA-TTP) has afforded several organic superconductors. Highly conducting molecular metals with unusual oxidation states (+1, +5/3 and neutral) have been developed on the basis of 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene (BDT-TTP) derivatives and analogous metal derivatives M(dt) 2 (M = Ni, Au).

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Structural aspects of the ambient-pressure BEDT-TTF superconductors

Cited by 118 publications

References 0 publications

Design and Preparation of a Quantum Spin Liquid Candidate κ-(ET)2Ag2(CN)3 Having a Nearby Superconductivity

Design and Preparation of a Quantum Spin Liquid Candidate κ-(ET)2Ag2(CN)3 Having a Nearby Superconductivity

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4
Foury-Leylekian
¹
,
Pouget
²
,
Lee
³

et al. 2010
Phys. Rev. B
27
3
34
0
View full text Add to dashboard Cite

Tetrathiapentalene-based organic conductors

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Structural aspects of the ambient-pressure BEDT-TTF superconductors

Cited by 118 publications

References 0 publications

Design and Preparation of a Quantum Spin Liquid Candidate κ-(ET)2Ag2(CN)3 Having a Nearby Superconductivity

Design and Preparation of a Quantum Spin Liquid Candidate κ-(ET)2Ag2(CN)3 Having a Nearby Superconductivity

Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4Foury-Leylekian1, Pouget2, Lee3 et al. 2010Phys. Rev. B273340View full textAdd to dashboardCite

Tetrathiapentalene-based organic conductors

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Density-wave instability inα−(BEDT-TTF)2KHg(SCN)4
Foury-Leylekian
¹
,
Pouget
²
,
Lee
³

et al. 2010
Phys. Rev. B
27
3
34
0
View full text Add to dashboard Cite