Self assemble pattern formation for inhomogeneous electronic states in highly correlated organic Mott system

本研究的目的是了解高关联有机分子系统中出现在Mott绝缘体-金属跃迁附近的本征非均匀电子态。利用同步辐射扫描微区红外光谱（SMIS）技术，获得了Mott绝缘体与关联金属非均匀相分离的真实的空间成像。本研究项目取得的成果如下1.阐明了在带宽受分子取代精细控制的有机Mott体系中，Mott绝缘体-金属跃迁附近电子相分离的起源。通过SMIS测量得到了相分离的生长条件和相分离模式.发现微观电子相分离与输运性质等宏观现象密切相关。研究了电阻率与相分离的关系， ...更多信息 离子。利用扫描隧道显微镜研究了电荷有序跃迁。我们观察到真实的空间电荷有序模式的分子尺度分辨率的STM。我们发现通过引入非磁性杂质，超导转变温度Tc大幅度降低。同时，准粒子的散射时间变短。Tc与散射时间的关系表明有机超导体中存在非BCS型的超导电性.我们发现了有机Mott体系的超导电性与Mott绝缘体相之间的竞争关系。在磁场作用下，超导性被抑制，但Mott绝缘体相扩展.通过X射线辐照发现了Mott绝缘体中有效的载流子掺杂。X射线照射在晶体中引入了分子缺陷。施主和受主分子之间的电荷转移被局部调制，并发生有效的载流子掺杂。这是首次成功地对BEDT-TTF分子基有机导体进行可控载流子掺杂。少

The purpose of this research is the understanding of the intrinsic inhomogeneous electronic states appeared nearby the Mott insulator- metal transition in the highly correlated organic molecular system. The real space imaging of the inhomogeneous phase separation of the Mott insulator and the correlated metal was obtained by means of the scanning micro-region infrared spectroscopy (SMIS) using synchrotron radiation. The achievements in this research project are listed below1. We clarified the origin of the electronic phase separation nearby the Mott insulator-metal transition in the organic Mott system whose bandwidth was finely controlled by the molecular substitution. The growth condition and pattern of the phase separation were obtained by SMIS measurements.2. We hound that the microscopic electronic phase separation was closely related to the macroscopic phenomena like as the transport properties. We investigated the relationship between electrical resistivity and the phase separat … More ion.3. Charge order transition was investigated by means of the scanning tunnel microscopy. We observed the real space charge order pattern in the molecular scale resolution by STM.4. We found large reduction of the superconducting transition temperature Tc by introducing the non-magnetic impurities. At the same time, the scattering time of the quasi-particles became short. The relation between Tc and scattering time indicated the non-BCS type superconductivity in the organic superconductors.5. We found the competitive relation between the superconductivity and Mott insulator phases in the organic Mott system. Under magnetic fields, the superconductivity was suppressed but the Mott insulator phase spread.6. We discovered the effective carrier doping to the Mott insulator by the X-ray irradiation. X-ray irradiation introduced the molecular defects in the crystal. Charge transfer between donor and acceptor molecules was modulated locally and the effective carrier doping took place. It is the first success of the controllable carrier doping to the BEDT-TTF molecule based organic conductors. Less