Research of Competition and Coexistence of Charge-ordered and Superconducting States in Novel Organic Superconductors

新型有机超导体中电荷有序态与超导态的竞争与共存研究

基本信息

批准号：
17540315
负责人：
MORI Hatsumi
金额：
$ 1.99万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

In order to investigate the relationship between charge ordering and superconductivity for novel organic superconductor beta-(meso-DMBEDT-TTF)_2PF_6, the detailed measurements of electrical resistivity and magnetoresistivity have been carried out.Our results are followings.(1) Determination of superconducting state by measurements of electrical and magnetoresistivity under pressureThe detailed measurements of electrical resistivity under pressure revealed that the resistance drop of observed at Tc(onset) = 4.6 K under relatively low pressure 0.6 kbar, whose superconductivity was confirmed by applying magnetic field. The superconducting phase extends widely to Tc=2.6K under 5.2 kbar.(2) Determination of charge-ordered state by temperature and magnetic field dependences of magnetoresistance under pressure The temperature dependence of resistivity for beta-(meso-DMBEDT-TTF)_2PF_6 is peculiar under 0.6 kbar; the resistivity minimum is observed at 60K, the increase of resistivity by 8 times with lowering temperature, and the sudden drop of resitivity is observed at 4.6K. The raman spectroscopy under pressure demonstrates that the resistivity increase is originated by charge ordering (CO). In this CO region, large magnetoresistance was observed, its increasing rate (ΔR/R(0T)) increases with applying pressure, and in even the metallic state at low temperatures, the magnetoresistance can be observed. Therefore, the illustrated P-T phase diagram reveals that the static and dyanimical CO states exist in neighbouring of superconducting state, which is the first experimental observation among molecular superconductors.

为了研究新型有机超导β-（Meso-dmbedt-TTF）_2PF_6的充电顺序和超导能力之间的关系，对电阻和磁磁性的详细测量已经进行了。压力表明，在相对低压0.6 kbar下，在TC（发病）= 4.6 K观察到的电阻下降，通过施加磁场证实了其超导性。超导率在5.2 kbar下广泛扩展至TC = 2.6K。（2）按温度和磁场依赖磁场依赖性在压力下的磁场依赖性确定电荷的状态。在压力下，β-（Meso-dmbedt-TTF）的电阻温度依赖性在0.6 kbar下是0.6 kbar;在60K处观察到电阻最小值，在温度降低的情况下，电阻增加了8倍，并且在4.6K处观察到了阳性的突然下降。压力下的拉曼光谱法表明，电阻的增加最初是通过电荷排序（CO）产生的。在该CO区域中，观察到较大的磁倍率，随着施加压力，其增加的速率（ΔR/R（0T））增加，即使在低温下的金属状态下，也可以观察到磁度。因此，插图的P-T相图表明，静态和染色性CO状态存在于超导状态的相邻中，这是分子超导体之间的第一个实验观察。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Superconductivity in the vicinity of charge ordered state in organic conductor β-(meso-DMBEDT-TTF)_2PF_6

有机导体β-(meso-DMBEDT-TTF)_2PF_6中电荷有序态附近的超导性

DOI：
发表时间：
2007
期刊：
J. Phys. Soc. Jpn. 76
影响因子：
0
作者：
K. Yoshimi;M. Nakamura;and H. Mori
通讯作者：
and H. Mori

Intrinsic Carrier Doping in Antiferromagnetically Interacted Supra-molecular Copper Complexes with Pyra-TTF [=(pyrazino)tetrathia-fulvalene] as the Ligand, [Cu^<II>Cl_2(Pyra-TTF)] and (Pyra-TTF)2-[Cu^I_3Cl_4(Pyra-TTF)]

以 Pyra-TTF [=(吡嗪基)四硫富瓦烯]为配体、[Cu^<II>Cl_2(Pyra-TTF)] 和 (Pyra-TTF)2-[ 反铁磁相互作用超分子铜配合物中的本征载流子掺杂

DOI：
发表时间：
2008
期刊：
Inorg. Chem. 47
影响因子：
0
作者：
S. Ichikawa;S. Kimura;K. Takahashi;; H. Mori;G. Yoshida;M. Matsuda;H. Tajima;and J. Yamaura
通讯作者：
and J. Yamaura

Crystal structures and conductivities of new hydrogen-bonded system: CnDT-EDO-TTF and BzDT-EDO-TTF

新型氢键体系的晶体结构和电导率：CnDT-EDO-TTF和BzDT-EDO-TTF