Superconductivity of Layered Organic Compound β-(BDA–TTP)<sub>2</sub>SbF<sub>6</sub>, Where BDA–TTP is 2,5-Bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene

Shimojo, Y.; Ishiguro, Takehiko; Toita, Takashi; Yamada, Jun−ichi

doi:10.1143/jpsj.71.717

Cited by 23 publications

(13 citation statements)

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“…Most organic superconductors have so far been derived from TCF (tetrachalcogenafulvalene) derivatives, such as BEDT-TTF [bis(ethylenedithio)-tetrathiafulvalene], DMET [dimethyl(ethylenedithio)diselenadithia fulvalene], and BETS [bis(ethylenedithio)tetraselenafulvalene] [3], whereas we have found that BDA-TTP [2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene], which comprises the BDY (bis-fused 1,3-dithiol-2-ylidene) unit instead of the TTF (tetrathiafulvalene) unit as a p-electron system, produces the superconducting b-(BDA-TTP) 2 X (X ¼ SbF 6 , AsF 6 , PF 6 , GaCl 4 ) salts [4]. Additionally, we revealed that the b-(BDA-TTP) 2 SbF 6 superconductor [5] has the largest value of the effective cyclotron mass (m c Ã ¼ 12.4 AE 1.1 m e ) yet found in an organic superconductor [6]. Further production of such organic superconductors as to exhibit notable physical properties that cannot be observed in the TCF-containing superconductors is considered to be of importance in the development of this field.…”

Section: Introductionmentioning

confidence: 82%

New Organic Conductors and Superconductors Based on Dihydro-TTF (DHTTF) Donors

Yamada

Hayashi

Akutsu

et al. 2005

Molecular Crystals and Liquid Crystals

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The synthesis of dihydrotetrathiafulvalene (DHTTF) donors and the preparation of their charge-transfer (CT) salts have been undertaken to develop new organic metals and superconductors. The molecular structures of methylenedithio-DHTTF (MDHT), 1,4-dioxane-2,3-diyldithio-DHTTF (DODHT), and methylmethylidenedithio-DHTTF (Me-MDHT) are secured by X-ray crystallographic analyses. These DHTTF donors provide CT salts characterized by a wide range of conducting behavior from semiconducting to metallic and superconducting. The crystal structures of CT salts from each category are described.

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Section: Introductionmentioning

confidence: 82%

New Organic Conductors and Superconductors Based on Dihydro-TTF (DHTTF) Donors

Yamada

Hayashi

Akutsu

et al. 2005

Molecular Crystals and Liquid Crystals

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“…κ-(MDT-TTF)2AuI2 (Tc = 3.5 K) exhibited a Hebel-Slichter coherent peak just below Tc, indicating a BCS-type gap with s-symmetry [156]. On the other hand, d-wave like superconductivity has been suggested for β-(BDA-TTP)2SbF6 [143,144]. β-(BDA-TTP)2X (X = SbF6, AsF6) exhibited a slight Tc increase at the initial stage of uniaxial strain parallel to the donor stack and interlayer direction while Tc decreased perpendicular to the donor stack [142].…”

Section: Superconductors Of Other Electron Donor Moleculesmentioning

confidence: 99%

“…Besides TMTSF, TMTTF, BO, ET, and BETS superconductors, there are other superconductors (Scheme 7, numbers in bracket are the total members of each superconducting family and the highest Tc) of CT salts based on symmetric (BEDSe-TTF [140] and BDA-TTP [141][142][143][144]) and asymmetric donors (ESET-TTF [145], S,S-DMBEDT-TTF [146], meso-DMBEDT-TTF [147,148], DMET [149], DODHT [150], TMET-STF [151], DMET-TSF [152], DIETS [153], EDT-TTF [154], MDT-TTF [155,156], MDT-ST [157,158], MDT-TS [159], MDT-TSF [160][161][162][163], MDSe-TSF [164], DTEDT [165], and DMEDO-TSeF [166,167]). κ-(MDT-TTF)2AuI2 (Tc = 3.5 K) exhibited a Hebel-Slichter coherent peak just below Tc, indicating a BCS-type gap with s-symmetry [156].…”

Section: Superconductors Of Other Electron Donor Moleculesmentioning

confidence: 99%

Development and Present Status of Organic Superconductors

Saito¹,

Yoshida²

2012

Superconductors - Materials, Properties and Applications

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based on the two main requirements for the conductivity, namely, (1) a uniform segregated stacking of the same kind of component molecules, and (2) the fractional CT state (uniform partial CT) of the molecules. Since TTF•TCNQ has a low-dimensional segregated stacking, it showed a metal-insulator (MI) transition (Peierls transition) below about 60 K. For TTF•TCNQ, the Peierls transition occurs by the nesting of the one-dimensional Fermi surface causing lattice distortion associated with the strong electron-phonon interaction and forms charge density wave (CDW). There are also several one-dimensional organic metals which show MI transitions by the formation of spin density wave (SDW) when the periodicity of the SDW coincides with the nesting vector of Fermi surface and no lattice distortion occurs in this case. An increase in the electronic dimensionality is inevitable to prevent the nesting of Fermi surfaces and develop superconductors. Several attempts have been made through "pressure", "heavy atom substitution", or "peripheral addition of alkylchalcogen groups" (Fig. 1). The latter two correspond to the enhancement of the self-assembling ability of the molecules. Appropriate examples taking TTF derivatives are shown in Fig. 1. Based on TMTSF molecules several superconductors under pressure have been prepared with warped one-dimensional Fermi surface since 1980 (a in Fig. 1) [9-14]. In general, the ratio of transfer energies (t// / t ⊥) is larger than 3 for one-dimensional Fermi surface and a closed two-dimensional Fermi surface is formed when t// ≤ 3t ⊥ , where t// and t ⊥ are the transfer energies along the directions of the largest and second largest intermolecular interactions. The BO (BEDO-TTF) molecules afforded stable two-dimensional metals having two-dimensional Fermi surface (b in Fig. 1) owing to the strong self-assembling ability by intermolecular S•••S and hydrogen-bonds [15], and only two superconductors are known since 1990 (Tc ≤ 1.5 K). The substitution of an ethylenedioxy group with an ethylenedithio group (BO → ET (BEDT-TTF)) destabilized the metallic state of BO compounds and provided unstable two-dimensional conductors (c in Fig. 1). Consequently, variety of superconductors and other functional solids have been developed based on twodimensional metals of ET since 1982 (Tc ≤ 13.4 K) [16-20] and its analogues (Tc ≤ 10 K) [21]. Figure 1. Strategy for chemical modification of the TTF molecule to increase (arrows) or decrease (dotted arrow) the electronic dimensionality by the aid of enhancement or suppression of the selfassembling ability of the molecules, respectively [16]. Typical Fermi surfaces of TMTSF (a: (TMTSF)2NbF6), BO (b: (BO)2.4I3), and ET (c: β-(ET)2I3) CT solids are depicted.

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“…1͑b͒. Unconventional d-wave superconductivity similar to the BEDT-TTF salts has been suggested by the specific heat 7 and scanning tunneling microscope ͑STM͒ measurements. 8 The BDA-TTP salts are the key materials for understanding how the dimerized BEDT-TTF is a prerequisite for high T C in organic superconductors, since they have two distinct properties different from -type BEDT-TTF salts.…”

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confidence: 92%

Roles of spin fluctuation and frustration in the superconductivity ofβ−(BDA-TTP)2X(
Ito
¹
,
Ishihara
²
,
Tanaka
³

et al. 2008
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␤-type BDA-TTP ͓BDA-TTP=2,5-bis͑1,3-dithian-2-ylidene͒-1,3,4,6-tetrathiapentalene͔ salts possess high transition temperatures T C reaching 7 K among organic superconductors. T C of ␤-͑BDA-TTP͒ 2 X ͑X = SbF 6 , AsF 6 ͒ is studied by resistive measurements under uniaxial compression. T C once increases and takes a maximum under compression parallel to the donor stack while it decreases under compression perpendicular to the donor stack. These results are in agreement with the half-filled Hubbard model on the triangular lattice in which the compression controls the spin fluctuation and frustration in the weak pressure region.

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Superconductivity of Layered Organic Compound β-(BDA–TTP)₂SbF₆, Where BDA–TTP is 2,5-Bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene

Cited by 23 publications

References 10 publications

New Organic Conductors and Superconductors Based on Dihydro-TTF (DHTTF) Donors

New Organic Conductors and Superconductors Based on Dihydro-TTF (DHTTF) Donors

Development and Present Status of Organic Superconductors

Roles of spin fluctuation and frustration in the superconductivity ofβ−(BDA-TTP)2X(
Ito
¹
,
Ishihara
²
,
Tanaka
³

et al. 2008
Phys. Rev. B
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0
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Superconductivity of Layered Organic Compound β-(BDA–TTP)2SbF6, Where BDA–TTP is 2,5-Bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene

Cited by 23 publications

References 10 publications

New Organic Conductors and Superconductors Based on Dihydro-TTF (DHTTF) Donors

New Organic Conductors and Superconductors Based on Dihydro-TTF (DHTTF) Donors

Development and Present Status of Organic Superconductors

Roles of spin fluctuation and frustration in the superconductivity ofβ−(BDA-TTP)2X(Ito1, Ishihara2, Tanaka3 et al. 2008Phys. Rev. BSelf Cite14090View full textAdd to dashboardCite

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Superconductivity of Layered Organic Compound β-(BDA–TTP)₂SbF₆, Where BDA–TTP is 2,5-Bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene

Roles of spin fluctuation and frustration in the superconductivity ofβ−(BDA-TTP)2X(
Ito
¹
,
Ishihara
²
,
Tanaka
³

et al. 2008
Phys. Rev. B
Self Cite
14
0
9
0
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