摘要:
利用电化学结晶的方法制备了高质量的（BEDT-TTF）[FeBr4]单晶,通过四圆单晶衍射确定了其晶体结构为三斜晶系.在高温区,晶体电阻率与电子的热激发效率以及载流子受电离杂质散射的强弱有关.在低温区,晶体的导电性只依赖体内杂质缺陷等的电离.由于电子受到Lorentz力的作用增加了与晶格的碰撞次数,晶体的磁阻率表现为正值.晶体的磁性主要由三价铁离子决定,晶体中三价铁离子之间不具有铁磁耦合或反铁磁耦合.电子顺磁共振谱中同时发现π电子和d电子的共振信号,温度降低可使π电子和d电子的耦合作用增强,晶体沿着不同轴旋转,其共振信号随旋转角度的变化存在着巨大的差异.
Abstract:
（BEDT-TTF）[FeBr4] single crystal is grown with electrochemical crystallization method, and its crystal structure is determined by four-circle single crystal diffraction. From 300 K to 185 K, the crystal resistivity is related to the efficiency of electronic thermal excitation and the strength of the electron scattering by ionized impurities, while from 185 K to 10 K, the conductivity depends mainly on the ionization of the impurities and defects in crystal. Because of electron scattering increased by the effect of Lorentz force, the magnetic reluctance has positive value. The magnetism of the crystal is determined mainly by magnetic ferric ions, and neither ferrromagnetic coupling nor antiferromagnetic coupling between the ferric ions in crystalis induced. The resonance signals of the electrons and the d electrons are found in the electron paramagnetic resonance spectra, and the π-d coupling is enhanced as the temperature is decreased. When the crystal rotates along different axes, the resonance signal changed with the angle of rotation, is greatly different.
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