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Synthesisand properties of C_<60> based mutielement compounds

C_<60>基多元素化合物的合成与性能

基本信息

批准号：
08454095
负责人：
IWASA Yoshihiro
金额：
$ 5.06万
依托单位：
Japan Advanced Institute of Science and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454095/
关键词：
fullerene polymers carbon allotropes energetics tullerene superconductors band filling control highly doped fulleride ammoniated fulleride antiferromagnetic state Fullerenes multi-element system superconductivity metal-insulator tran

项目摘要

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

我们对富勒烯基固体进行了基础研究，得到了以下结果：1。富勒烯聚合物我们通过高压-高温处理分子化合物（ET）2C60，成功地选择性地合成了一种2+2环加合C60的富勒烯二聚体。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，我们澄清了所有聚合物形式的富勒烯比单体形式更稳定。本文建立了富勒烯聚合物的热力学模型。这些聚合物相之间的能量差小于石墨和金刚石之间的能量差。多富勒烯超导体[2-1]nh3k3c60中的反铁磁序超导体-绝缘体跃迁是固体物理中普遍而基本的问题之一。在富勒烯的情况下，这种转变是通过NH3分子插入到更超导的K3C60中来发生的。本文采用多种方法对nh3k3c60进行了研究，阐明了nh3k3c60从超导体向非超导体转变的机理。我们发现nh3k3c60的电子基态是一个反铁磁绝缘体。这一结果清楚地表明，nh3k3c60中的超导性损失是由磁性引起的，这与众所周知的铜和有机超导体有很好的相似之处。2-2: (NH3) xnaa2c60 (O)的高压效应。5<x<l， A=K, Rb)超导体。标题超导体的Tc与晶格参数之间存在异常相关性，这与标准A3C60超导体的异常相关性相反。在静水压力下研究了Tc/晶格参数的相关性，结果表明，这些氨化超导体的Tc不再简单地受间富勒烯间距的影响。2-3：高掺杂态超导体发现了新的高掺杂态富勒烯超导体。非价态k3ba3c60和十价态k2ba4c60表明，高掺杂体系的超导性判据与低掺杂体系的判据明显不同。少