Crystal Structures of Organic Superconductor, (BEDT-TTF)2Cu(NCS)2, at 298 K and 104 K

Urayama, H.; Yamochi, Hideki; Saito, Gunzi; Sato, Shôichi; Kawamoto, Atsushi; Tanaka, Jirō; Mori, Takehiko; Maruyama, Yusei; Inokuchi, Hiroo

doi:10.1246/cl.1988.463

Cited by 171 publications

(73 citation statements)

References 4 publications

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“…3b, two Cat-EDT-TTF skeletons in the pink and blue molecular units come face-toface to form the dimeric structure. Each dimer is orthogonally arranged with the zigzag pattern, which is traditionally termed as the ''k-type'' molecular arrangement in the field of the BEDT-TTF-based molecular conductors [37][38][39] . In the present molecular arrangement, there exist the intra-and inter-dimer short atomic contacts of SyS B3.54 and 3.45-3.56 Å (SeySB3.59-3.64 and 3.50-3.66 Å), respectively, for j-S (j-Se), as shown in the dotted lines.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure

et al. 2013

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Purely organic materials are generally insulating. Some charge-carrier generation, however, can provide them with electrical conductivity. In multi-component organic systems, carrier generation by intermolecular charge transfer has given many molecular metals. By contrast, in purely organic single-component systems, metallic states have rarely been realized although some neutral-radical semiconductors have been reported. Here we uncover a new type of purely organic single-component molecular conductor by utilizing strong hydrogenbonding interactions between tetrathiafulvalene-based electron-donor molecules. These conductors are composed of highly symmetric molecular units constructed by the strong intra-unit hydrogen bond. Moreover, we demonstrate that, in this system, charge carriers are produced by the partial oxidation of the donor molecules and delocalized through the formation of the symmetric intra-unit hydrogen bonds. As a result, our conductors show the highest room-temperature electrical conductivity and the metallic state under the lowest physical pressure among the purely organic single-component systems, to our knowledge.

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Section: Resultsmentioning

confidence: 99%

Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure

et al. 2013

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“…The investigated single crystals of κ-(BEDT-TTF) 2 Cu(NCS) 2 and β″-(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3 were prepared by standard electrochemical processes described elsewhere [26,27]. The specific heat was measured by use of a continuous relaxation technique as described in more detail in the Appendix of Ref.…”

Section: Methodsmentioning

confidence: 99%

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

Beyer

Wosnitza

2013

Low Temperature Physics

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In this short review, we report on the recently found growing experimental evidence for the existence of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in quasi-two-dimensional organic superconductors. At high magnetic fields aligned parallel to the conducting organic layers, we observe an upturn of the upper critical field beyond the Pauli limit, as evidenced by specific-heat and torque-magnetization measurements. Inside the superconducting state a second thermodynamic transition emerges. These features appear only in a very narrow angular region close to parallel-field orientation.

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“…The basic structural building blocks of these materials are large, elongated ET planar molecules stretching along the c-axis forming the conducting layer. 44 These thick conducting layers are separated by thin insulating spacers of planar NCS-molecules extending in the ab-plane. The NCS counter-ions take one charge per two ET-molecules leaving the ET HOMO partially unfilled.…”

Section: Layered Organic Superconductorsmentioning

confidence: 99%

Electronic collective modes and superconductivity in layered conductors

2003

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A distinctive feature of layered conductors is the presence of low-energy electronic collective modes of the conduction electrons. This affects the dynamic screening properties of the Coulomb interaction in a layered material. We study the consequences of the existence of these collective modes for superconductivity. General equations for the superconducting order parameter are derived within the strong-coupling phonon-plasmon scheme that account for the screened Coulomb interaction. Specifically, we calculate the superconducting critical temperature Tc taking into account the full temperature, frequency and wave-vector dependence of the dielectric function. We show that low-energy plasmons may contribute constructively to superconductivity. Three classes of layered superconductors are discussed within our model: metal-intercalated halide nitrides, layered organic materials and high-Tc oxides. In particular, we demonstrate that the plasmon contribution (electronic mechanism) is dominant in the first class of layered materials. The theory shows that the description of so-called "quasi-two-dimensional superconductors" cannot be reduced to a purely 2D model, as commonly assumed. While the transport properties are strongly anisotropic, it remains essential to take into account the screened interlayer Coulomb interaction to describe the superconducting state of layered materials.

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Crystal Structures of Organic Superconductor, (BEDT-TTF)2Cu(NCS)2, at 298 K and 104 K

Cited by 171 publications

References 4 publications

Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure

Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure

Emerging evidence for FFLO states in layered organic superconductors (Review Article)

Electronic collective modes and superconductivity in layered conductors

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