DEVELOPMENT OF HIGH TEMPERATURE ORGANIC SUPERCONDUCTORS

1)为了开发新的超导体，我们主要研究了不对称给体DMET的衍生物分子；DMPT，DMMT，DIMET和ETDM。DMPT和DMMT是DMET侧骨不同的衍生物，而DMET和ETDM的主链与DMET相同，但杂原子排列与DMET不同。DIMET和ETDM的一些自由基盐在低温下表现出金属行为，因此仍有可能发现基于DIMET或ETDM的超导体。2)对富勒烯超导体也进行了研究。发现C_<60>M_3由金属相转变为超导相。金属叠氮化物掺杂法制备了具有100%超导体积的材料（C_<60>K_2Cs_1），证明了该方法是制备良好的富勒烯超导体的有效方法。借助重整化理论，我们得到了C_<60>超导体更可靠的相干长度。3)以btt - ttf盐为例，我们……More发现了五种超导体；(k) - BEDT-TTF _2Cu (nc) _2 (Tc = 10.4 k),卡巴”——(BEDT-TTF) _2Cu_2 (CN) (Tc = 3.8 k)盐以及k - (BEDT-TTF) _2Cu (CN) [N (CN) _2] (Tc = 11.2 k),α- (BEDT-TTF) _2NH_4 (SCN) _4 (Tc = 0.8 k),α- (BEDT-TTF) _2KHg (SCN) _4 (Tc = 0.1 - -0.2 k)。此外，在β (BEDT-TTF)_2I_3中发现了一个新的超导相（Tc=2k）。在这些盐中，我们研究了对Tc的各向同性效应，用^<13>CH_2和CD_2取代了供体分子的CH_2基团。在常压ttf基有机超导体中，kappa-(BEDT-TTF)_2Cu(CN)[N(CN)_2]的氘化盐的Tc（12.3K）最高。在这一研究过程中，我们提出了超导体的分子和晶体设计。即“大而薄的阴离子形成二维阴离子层，形成高Tc盐”。我们还通过发现阴离子层开口与给体填充模式之间的结构相关性以及Tc与给体层传导体积之间的结构相关性，推导出了一种新的分子和晶体设计。利用BEDT-TTF和新制备的供体分子，我们获得了新的超导体和一些低至液态He温度的金属盐。目前对高Tc有机超导体的进一步研究正在进行中。少

1)To develop new superconductors,we investigated mainly on the derivative molecules of an unsymmetrical donor DMET;DMPT,DMMT,DIMET and ETDM.DMPT and DMMT are the derivatives with different side-bones from DMET,and DIMET and ETDM have the same backbone to that of DMET,but a different arrangement of hetero-atoms from that of DMET.Several radical salts of DIMET and ETDM show a metallic behavior at low temperature,so there remains the possibilities that the superconductors based on DIMET or ETDM will be discovered.2)The fullerene superconductors are also studied. C_<60>M_3 was found to have a transition from metallic phase to a superconducting phase. The doping method with metal azide produced the material (C_<60>K_2Cs_1) which had 100% superconducting volume,so this method was clarified to be efficient for making a good fullerene superconductor. We obtained more reliable coherent lengths for C_<60> superconductors by the aid of the renormalization theory.3)In the case of BEDT-TTF salts,we … More discovered five superconductors; kappa-(BEDT-TTF)_2Cu(NCS)_2(Tc=10.4K), kappa'-(BEDT-TTF)_2Cu_2(CN)_3(Tc=3.8K), kappa-(BEDT-TTF)_2Cu(CN)[N(CN)_2](Tc=11.2K), alpha-(BEDT-TTF)_2NH_4(SCN)_4(Tc=0.8K), alpha-(BEDT-TTF)_2KHg(SCN)_4(Tc=0.1-0.2K). In addition, we observed a new superconducting phase (Tc=2k) in beta(BEDT-TTF)_2I_3. In these salts we studied the isotropic effect on Tc, substituting the CH_2 groups of the donor molecules by ^<13>CH_2 and by CD_2. The deuterated salt of kappa-(BEDT-TTF)_2Cu(CN)[N(CN)_2] recorded the highest Tc(12.3K)among the ambient pressure TTF-based organic superconductors.In the process of this investigation we proposed a molecular and crystal designing for superconductor.Namely,"big and thin anion which forms two-dimensional anion layer gives the high Tc salts."We have also derived a new molecular and crystal design by finding the structural correlations between the opening of the anion layer and the donor packing pattern and the one between Tc and the conduction volume of the donor layer.Employing not only BEDT-TTF but also newly prepared donor molecules,we have obtained the new superconductors and a number of metallic salts down to liquid He temperature.Further research for the high Tc organic superconductors is currently under way. Less