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关联有机分子体系中Mott绝缘体-金属转变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绝缘体及其相关金属非均匀相分离的实空间成像。本研究项目取得的成果如下1。阐明了有机Mott体系中Mott绝缘体-金属相变附近电子相分离的起源，其带宽受分子取代的精细控制。通过SMIS测试，得到了相分离的生长条件和形态。我们发现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…的关系更多的离子。用扫描隧道显微镜研究了其电荷顺序转变。我们用扫描电子显微镜观察到了分子尺度分辨率中的真实空间电荷有序图形。通过引入非磁性杂质，我们发现超导转变温度T_c有较大幅度的降低。同时，准粒子的散射时间变短。T_c与散射时间的关系表明有机超导体中存在非BCS型超导电性。发现了有机Mott体系中超导电性与Mott绝缘体相之间的竞争关系。在磁场作用下，超导电性受到抑制，但Mott绝缘体相展宽。通过X射线辐照，我们发现了Mott绝缘体中的有效载流子掺杂。X射线辐照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，发生了有效的载流子掺杂。这是BEDT-TTF分子基有机导体首次实现可控载流子掺杂。较少

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