Japan-CIS joint project for optical studies of new materials

在这次研究项目中，我们邀请了4名俄罗斯科学家和1名乌兹别克斯坦科学家，并派遣了4名日本科学家到俄罗斯、拉脱维亚和爱沙尼亚。通过这次交流项目，我们专注于固体富勒烯及其相关化合物的研究。我们的成就之一是发现了一种新的超导三元化合物Na-N-C；60&gt；这是第一个含Na的超导体。在改进合成方法后，用X射线衍射仪、SQUID磁强计、ESR和低场微波吸收等手段对其结构和超导性能进行了表征。我们提出超导电性是由保护歧化相分离的氮物种引起的。在这一成功结果的基础上，我们扩展了C&lt；60和Gt；的三元化合物。第一个化合物是通过碱金属掺杂有机-DON-…之间的电荷转移化合物制备的More或和C_&lt；60&gt；。我们发现在中温略高于室温的掺杂材料中存在超导电性。碱金属掺杂使聚烷烃-噻吩基C_(60&gt；60&gt；)、C_(&lt；60&gt；60&gt；F_&lt；48&gt；和C_&lt；70&gt；F_&lt；58&gt；在真空紫外光激发下(束线3A1的波荡器)，从IMS的UVSOR电子储存环获得的发光强度在相变温度处有明显的跃迁，这意味着虽然激发态是Frenkel类型，但晶场的影响很强。C_&lt；60&gt；F_&lt；48&gt；和C_&lt；70&gt；F_&lt；58&gt；的发光表现出一个复杂的弛豫过程，结合准分子激光激发的实验，得出了发光由三部分组成的结论。最有趣的是，随着波动体辐射的照射，发光强度降低。这一现象被证明与CF光解离过程有关。对松弛过程的更详细的分析正在进行中。较少

During this research project, we invited 4 Russian scientists and 1 Uzbekistan scientist and send 4 Japanese scientists to Russia, Latovia, and Estonia.A Uzbekistan young scientist sponsored by JSPS also joined this research project. Through this exchange program, we focused on the research on solid fullerenes and related compounds.One of our achievement is the discovery of a new superconducting ternary compound, Na-N-C_<60>, which is the first Na-containing superconductor. After the effort to improve the synthetic method, the structure and superconducting properties were characterized by X-ray diffraction, SQUID magnetometer, ESR,and low-filed microwave absorption. We proposed that the superconductivity was brought about by the nitrogen species which protects the disproportionation phase separation. Based on this successful result, we expanded the ternary compound involving C_<60>.The first one was prepared by the alkali-metal doping of the charge-transfer compound between organic-don … More or and C_<60>.We found a superconductivity in the materials doped at a moderate temperature slightly higher than room temperature. The doping of alkali-metal to the poly-alkey-thiophene C_<60> system showed a multi-phase superconductivity.The luminescence experiments of C_<60>, C_<60>F_<48> and C_<70>F_<58> was carried out under VUV excitation (undulator of beam line 3A1) from the UVSOR electron storage rings of IMS.The luminescence intensity showed a clear jump at the phase transition temperature which means that the effect of crystal field is very strong although the excited state is a Frenkel type. On the other hand the luminescence of C_<60>F_<48> and C_<70>F_<58> showed a complicated relaxation process.Combined with the experiment of the excimer laser excitation, it was concluded that the luminescence consists of three components in the decay curve. Most interestingly, the luminescence intensity decreased with the irradiation of the undulator radiation . It was evidenced that this phenomenon is related to the photo-dissociation process such as the cleavage of CF.More detailed analysis of the relaxation process is in progress. Less