Exploitation and Exploration of Organic Superconductors

有机超导体的开发与探索

• 批准号: 60470004
• 负责人: SAITO Gunzi
• 金额: $ 3.78万
• 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: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60470004/
• 关键词: Organic superconductor; Organic Metal; Low-dimensional conductor; Synthetic metals; CDW(charge density wave); SDW(spin density wave); FISDW(field induced SDW); BEDT-TTF; BEDT-TTF

We have studied chemical and physical properties of organic superconductors of <(TMTSF)_2> X and BEDT-TTF complexes, and other organic conductors for the purposes to understand the correlation between the physical and structural properties of the component compounds and the physical properties of the molecular assemblies in order to explore new organic superconductors. Our group has done the syntheses of organic superconductors, organic metals and conductors, single crystal growths, optical studies, and ESR works. As for the other studies such as NMR works, magnetoresistance measurements, field induced SDW works, Raman, X-ray crystallographic works, X-ray diffuse scattering works, and physical measurements under high pressure were carried out by a cooperation with the other groups. Proton spin relaxation measurement (NMR) in the superconducting state of <(TMTSF)_2> <ClO_4> revealed that the superconductivity in this system is associated with the anisotropic order parameter vanishing al … More ong lines on the Fermi surface. The field induced SDW phase in <(TMTSF)_2> <ClO_4> was studied and two temperature-dependent structures in the magnetoresistance curve were newly found in the field range of 15-17T and 22-25T. Also Shubnikov-de Haas like small oscillations whose period and amplitude showed anomalous temperature and field dependence were found. In the ambient pressure superconductor of <beta> - <(BEDT-TTF)_2> <I_3> , two superconducting states were observed (a low- <T_c> state with <T_c> =1.1-1.5K and a high <T_c> state with <T_c> =7-8K). The high <T_c> state, which was originally discovered under a pressure of 1.3 kbar, is found to remain stable after removal of pressure. Moreover it has also been observed even without application of pressure. The ESR g value, linewidth, lineshape, and spin susceptibility of single crystal of the <alpha> and <beta> phases of <(BEDT-TTF)_2> <I_3> were each found to show marked temperature and angular dependences. In both phases, a Dysonian line-shape characteristic of conduction-electron spin resonance was observed at room temperature when the microwave electric field is applied parallel to the quasi-two-dimensional conducting plane of the crystal. A number of BEDT-TTF complexes were newly synthesized ( <(beta)> '- <I_3> , <delta> -Au <Br_2> , -Au <Cl_2> -Au <Cl_4> , -Cu <(SCN)_2> etc.) and their crystal structures and physical properties were studied. A series of tetrakis(n-alkylchalcogeno)tetrachalcogenafulvalene (chalcogene=sulfur, selenium, tellurium) was synthesized and their chemical, physical, and structural properties were studied. A number of charge transfer complexes of tetrakis(n-methylchalcogeno)-TTF, azaTCNQ, HCBD, <F_4> TCNQ, BTDA-TCNQ, semicapped <C_6> <S_8> compound was synthesized and electrical conductivities other physical properties, and crystal structures of them were studied. Less

我们已经研究了<（TMTSF）_2> X和BEDT-TTF复合物的有机超导体的化学和物理性能，以及其他有机导体的目的，以了解分子组件的物理和结构特性与分子组件的物理性质之间的相关性以及分子组件的物理特性，以探索新的有机超级超级强制。我们的小组已经完成了有机超导体，有机金属和导体，单晶生长，光学研究和ESR工作的合成。至于其他研究，例如NMR作品，磁化测量值，现场诱导的SDW作品，拉曼，X射线晶体学工作，X射线弥漫性散射工作以及高压下的物理测量是通过与其他组的协调进行的。 <（tmtsf）_2> <clo_4>的超导状态中的质子自旋松弛测量（NMR）表明，该系统中的超导性与各向异性顺序参数有关消失的Al…更多地在Fermi表面上的线上。在<（tmtsf）_2> <clo_4>中，该场诱导的SDW相进行了研究，并且在15-17t和22-25t的磁场范围内新发现了磁倍率曲线中的两个温度依赖性结构。还发现了shubnikov-de Haas，如小振荡，其周期和放大器显示出异常的温度和场依赖性。在<beta> - <（bedt-ttf）_2> <i_3>的环境压力超导体中，观察到两个超导状态（具有<t_c> = 1.1-1.5k的低 - <t_c>状态，具有<t_c> = 7-8K的高<t_c>状态。最初在压力为1.3 kbar的压力下发现的高<t_c>状态在去除压力后保持稳定。此外，即使没有施加压力，也已经观察到它。发现<（bedt-ttf）_2> <i_3>的单晶的ESR G值，线宽，线形和自旋敏感性各自显示出明显的温度和角度依赖性。在这两个阶段中，当微波电场平行于晶体的准二维导电平面平行地施加微波电场时，在室温下观察到传导电子自旋共振的dysonian线形特征。新合成了许多BEDT -TTF复合物（<（beta）>' - <i_3>，<delta> -au <br_2>，-au <Cl_2> -au <Cl_4>，-cu <（scn）_2>等）及其晶体结构和物理性质和物理性质。合成了一系列的四甲基甲烷（n-烷基切尔卡氏菌）四核酸盐（chalcogene =硫磺=硫，硒，泰妥厄尔），并研究了它们的化学，物理和结构特性。合成了多种电荷转移络合物（N-甲基切尔切尔科诺）-TTF，AzatCNQ，HCBD，<F_4> TCNQ，BTDA-TCNQ，Semicapped <c_6> <s_8>化合物合成了其他物理托产和电气电导率的其他物理构图，以及其他晶体结构。较少的

项目成果

N.Okada;H.Yamochi;F.Shinozaki;K.Oshima;G.Saito: Chemistry Letters. 1986. 1861-1864 (1986)

N.Okada；H.Yamochi；F.Shinozaki；K.Oshima；G.Saito：化学快报。

M.Tokumoto;H.Bando;K.Murata;H.Anzai;N.Kinoshita;K.Kajimura;T.Ishiguro;G.Saito: Synthetic Metals. 13. 9-20 (1986)

M.Tokumoto；H.Bando；K.Murata；H.Anzai；N.Kinoshita；K.Kajimura；T.Ishiguro；G.Saito：合成金属。

Y.Nogami;S.Kagoshima;T.Sugano;G.Saito: Synthetic Metals. (1987)

Y.Nogami；S.Kagoshima；T.Sugano；G.Saito：合成金属。

G. SAITO: "Chemical and Physical Properties of Charge Transfer Complexes of Capped Donors (BEDT-TTF Series) and Uncapped Donors ( <TTC_n> -TTF Series)" Physica. 143B. 296-300 (1986)

G. SAITO：“封端供体（BEDT-TTF 系列）和未封端供体（<TTC_n> -TTF 系列）的电荷转移复合物的化学和物理性质”Physica。

T.Osada;N.Miura;G.Saito: Solid State Communication. 60. 441-444 (1986)

T.Osada；N.Miura；G.Saito：固态通信。