Effects of Pressures on 111 Iron-Based Superconductors
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摘要: 2008年发现的铁基超导体引发了全球超导研究的热潮。在本研究小组发现的铁基111体系的基础上,重点介绍111体系铁基超导体的压力效应,包括:111体系的3个组元LiFeAs、LiFeP、NaFeAs的超导转变随压力的演化;运用压力调控,获得111体系的最高超导转变温度;结合同步辐射技术,发现压力调控的111型铁基超导体的等结构演化以及对超导起关键作用的As-Fe-As键长和键角与超导转变温度的关联。Abstract: Here we briefly review the effects of pressure on what we have discovered about 111 iron based superconductor. The record high superconductor transition temperature (Tc) up to 31 K in 111 system is reached with applied pressure. The isostructural evolution with applied pressure reveals an intimate link between the As-Fe-As bond angle and bond length as well as the pressure-tuned superconductivity of 111 system using a synchrotron X-ray powder diffraction technique.
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