铁砷新超导材料的合成研究

The synthesis of new FeAs-based superconductors

文章简单介绍了作者在铁砷基材料的合成方面所取得的一系列工作进展.首先介绍了在空穴型掺杂的1111系统中发现超导电性的工作以及后续的发展.然后介绍了在氟基铁砷材料AeFeAsF(Ae=Sr,Ca,Ba和Eu)方面所取得的进展以及最新的超导转变温度的记录.最后介绍一种铁砷面间距较大的新型结构材料(Sr3Sc2O5)Fe2As2的合成以及一种新型超导体(Sr4V2O6)Fe2As2(Tc=37.2 K)的发现.

We report our progress in the synthesis of new compounds and superconductors in the FeAs- based family. First, we found superconductivity in hole-doped oxy-arsenide La1-xSrxFeAsO and Pr1-xSrxFeAsO. The Hall effect confirmed the hole charge carriers. Ho2 （T） is higher in the hole doped samples compared with the electron doped ones. This is attributed to the higher density of states in the hole doped side. Secondly, we present some results of the fluorine--derivative parent phases SrFeAsF, CaFeAsF and EuFeAsF which we discovered independently. By doping the system with electrons, we observed superconductivity （onset point of resistivity） at about 32 K for Sr0.6La0.4FeAsF, 52.8 K for Ca0.6Pr0.4 FeAsF, and 57.4 K for Ca0.6Nd0.4 FeAsF. Finally, we report the discovery of a new compound （Sr5Sc2O5） Fe2As2. We have also successfully fabricated a new superconductor （Sr4V2O6）Fe2 As2 （with a critical temperature of 37.2K） which is in the stoichiometric phase.