Synthesisand properties of C_<60> based mutielement compounds

我们对富勒烯基固体进行了基础性研究，取得了以下成果.富勒烯聚合物我们已经成功地选择性地合成了富勒烯二聚体，它是一个2+2环加成C60，通过高压高温处理的分子化合物（ET）2C 60。通过差示扫描量热法测量比较二聚体、一维聚合物和二维聚合物，我们澄清了富勒烯的所有聚合形式比单体形式更稳定。在这项工作中建立的富勒烯聚合物的能量。多相富勒烯超导体2 -1：NH_3K_3C_6O中的反铁磁有序超导体-绝缘体转变是固体物理中普遍存在的基本问题之一，对于富勒烯，这种转变是通过NH_3分子嵌入到富勒烯中而发生的。 ...更多信息 超导K3 C60我们用各种方法研究了非超导NH_3K_3C_6O的超导-非超导转变机制。我们发现NH_3K_3C_6O的电子基态是一个反铁磁绝缘体。这一结果清楚地表明，NH_3K_3C_6O的超导电性损失是由磁引起的，这为人们熟知的铜酸盐和有机超导体提供了一个很好的类比。2 -2：（NH_3）_xNaA_2C_6O（0.5 <x<1，A=K，Rb）超导体的高压效应标题超导体显示出Tc与晶格参数之间的反常相关，这与标准A_3C_60超导体中发现的相反。在静水压力下研究了Tc/晶格参数相关性，表明这些氨化超导体的Tc不再简单地由富勒烯间间距缩放。2 -3：高掺杂态的超导体发现了新的高掺杂态的富勒烯超导体，九价态的K_3Ba_3C_6O和十价态的K_2Ba_4C_6O表明，高掺杂态的超导性判据与低掺杂系统的。少

We have carried out a fundamental research on fullerene based solids and obtained the following results.1. Fullerene polymersWe have succeeded to selectively synthesize a fullerene dimer, which is a 2+2 cycloadduct of C60, by a high pressure-high temperature treatment of a molecular compound(ET)2C60. Comparing the dimer, one-dimensional polymer, and two-dimensional polymers by means of differential scanning calorimetry measurements, we clarified that all the polymeric forms of fullerenes are more stable than the monomer form. The energetics of the fullerene polymers are established in this work. The energy difference between these polymeric phases are smaller than the difference between graphite and diamond.2.Multinary fullerene superconductors2-1 : Antiferromagnetic order in NH3K3C6OSuperconductor-insulator transition is one of the universal and fundamental problems in solid state physics.In the case of fullerenes, this transition takes place by an intercalation of NH3 molecules into … More superconducting K3C60. We have investigated the nonsuperconducting NH3K3C6O by various means to clarify the mechanism of superconductor-nonsuperconductor transition. We found that the electronic ground state of NH3K3C6O is an antiferromagnetic insulator. This result clearly shows that he loss of superconductivity in NH3K3C6O is of magnetic origin, providing a nice analogy to the well know cuprate and organic superconductors.2-2 : High pressure effect of (NH3)xNaA2C6O(O.5<x<l, A=K, Rb)superconductorsThe title superconductors shows an anomalous correlation between Tc and lattice parameter, which is opposite to the one found in the standard A3C60 superconductors. The Tc/llattice parameter correlation was investigated under hydrostatic pressure, showing that Tc of these ammoniated superconductors is not scaled any more simply by the interfullerene spacings.2-3 : Superconductor at highly doped statesNew fullerene superconductors with highly doped states are found. The nonavalent K3Ba3C6O and decavalent K2Ba4C6Oshowed that the criterion of superconductivity in the highly doped state is significantly different form that of the low doped systems. Less