Molecular Design for the Development of Organic Superconductors with Two-dimensional Electronic Structure

二维电子结构有机超导体开发的分子设计

• 批准号: 03453002
• 负责人: KATO Reizo
• 金额: $ 4.42万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03453002/
• 关键词: Organic Superconductor; Low-dimensional Conductor; piDonor Molecule; Molecular Design; Spin Density Wave; TTF Compounds

The purpose of this project is to develop the molecular design for the organic superconductor with two-dimensional electronic structure and for the control of the dimensionality of the electronic structure. Our strategy is to form a flat molecular surface in the direction parallel to the molecular plane. On the basis of this idea, we have studied several organic donors, BEDT-TSeF (BETS), BMDT-TTF, ETIT, DMET-TSeF, TMET-STF and so on. Among them, BETS, BMDT-TTF, and ETIT provided a lot of tow-dimensional metals stable down to 4.2 K, which have confirmed the applicability of our molecular design. The isostructural salts (TMET-STF)_2X (X=ClO_4, BF_4) have a novel crystal structure, which consists of two types of donor columns ; the one is one-dimensional and the other is two-dimensional. Cation radical salts (DMET-TSeF)_2X have quasi one-dimensional electronic structure. The salts with X=AuI_2 and I_3, were found to be ambient pressure superconductors. In the case of X=AuI_2, AuBr_2, and AuC1_2, the field induced spin density wave (FISDW) states were observed. These are the first FISDW states in organic systems other than the TMTSF family.

本计画的目的是发展具有二维电子结构的有机超导体的分子设计，并控制电子结构的维度。我们的策略是在平行于分子平面的方向上形成平坦的分子表面。基于这一思路，我们对BEDT-TSeF（BETS）、BMDT-TTF、ETIT、DMET-TSeF、TMET-STF等几种有机给体进行了研究，其中BETS、BMDT-TTF、ETIT提供了大量的低至4.2K稳定的二维金属，证实了我们分子设计的适用性。同构盐（TMET-STF）_2X（X=ClO_4，BF_4）具有一种新颖的晶体结构，它由两种类型的给体柱组成：一种是一维的，另一种是二维的。阳离子自由基盐（DMET-TSeF）_2X具有准一维电子结构。X=AuI_2和I_3的盐是常压超导体。在X=AuI_2，AuBr_2和AuCl_2的情况下，观察到了场致自旋密度波（FISDW）态。这些是除TMTSF家族之外有机系统中的第一个FISDW状态。

项目成果

T.Naito: ""Structural and Electrical Properties of theta- and kappa-Type BEDT-TSeF Salts with Bromomercurate Anions"" Chem.Lett.1945-1948 (1991)

T.Naito：“具有溴汞酸阴离子的 theta 型和 kappa 型 BEDT-TSeF 盐的结构和电性能”Chem.Lett.1945-1948 (1991)

K.Oshima: ""De-Haas van Alphen Effect and the Fermi Surface in kappa-(BEDT-TTF)_2I_3"" Synth.Met.56(1). 2334-2338 (1993)

K.Oshima：“德哈斯范阿尔芬效应和 kappa-(BEDT-TTF)_2I_3 中的费米面”Synth.Met.56(1)。

R.Kato: ""Multivarious Faces of Organic Metals Based on Se-substituted BEDT-TTF Family"" Synth.Met.56(1). 1864-1869 (1993)

R.Kato：“基于 Se 取代的 BEDT-TTF 族的有机金属的多种面”Synth.Met.56(1)。

A.Kobayashi: "2-Dimensional Nature of BEDT-TSeF Compounds" Synth.Met.(1993)

A.Kobayashi：“BEDT-TSeF 化合物的二维性质”Synth.Met.(1993)

H.Kobayashi: "Superconducting Transition of a Grease-Coated Crystal of κ-(BEDT-TTF)_2[N(CN)_2]Cl" Chem.Lett.1997-2000 (1991)

H.Kobayashi：“κ-(BEDT-TTF)_2[N(CN)_2]Cl 的油脂涂层晶体的超导转变”Chem.Lett.1997-2000 (1991)