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

本研究的目的是了解在高度相关的有机分子体系中莫特绝缘体-金属跃迁附近出现的本征非均匀电子态。利用同步辐射扫描微区红外光谱（SMIS），获得了Mott绝缘体与相关金属非均匀相分离的真实空间成像。本课题研究成果如下：1。阐明了分子取代精细控制带宽的有机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测量得到了生长条件和相分离模式。结果表明，微观电子相分离与输运性质等宏观现象密切相关。我们研究了电阻率与相分离的关系。利用扫描隧道显微镜研究了电荷序跃迁。我们用STM.4观察了分子尺度分辨率下的真实空间电荷有序模式。我们发现，引入非磁性杂质后，超导转变温度Tc大幅降低。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具有非bcs型超导性。在有机Mott体系中，我们发现了超导性与Mott绝缘体相之间的竞争关系。在磁场作用下，超导性被抑制，但莫特绝缘子相扩展。我们通过x射线辐照发现了莫特绝缘体的有效载流子掺杂。x射线照射引入了晶体中的分子缺陷。供体分子和受体分子之间的电荷转移被局部调节，有效的载流子掺杂发生。这是首次成功地将可控载流子掺杂到BEDT-TTF分子基有机导体中。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