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1、铁基超导体BaFe2-xNixAs2中磁性相互作用的中子散射罗会仟中国科学院物理研究所北京凝聚态物理国家实验室摘要:铁基超导电性起源于对母体屮长程反铁磁序的压制，理解其超导微观机理的关键在于清楚认识磁性相互作用的演化规律，及其与超导电性的具体关系•本文以典型的电子型掺杂铁基超导体系BaFe2.xNixAs2为对象，介绍了中子散射实验针对其电子态相图、磁有序态、低能磁激发和高能自旋涨落谱等磁性物理的相关研究,着重总结它们随掺杂的系统而演变的规律，同时介绍了在自旋向列相中的最新研究进展•最后，基于这些结果，提出了磁性相互作用驱动的非常规铁基超导电性的可能物理图像.
2、关键词：铁基超导;中了散射;磁有序;磁激发;自旋涨落;作者简介：罗会仟E-mail:hqluo@iphy.ac.cn收稿日期：2017-07-25基金:国家重点基础研究发展计划(2011CBA00110,2012CB821400,2015CB921302)Neutronseatteringstudiesonthemagneticinteractioniniron-basedsuperconductorBaFe2-xNixAs2LUOHuiQianBeijingNa/d,onalLaboratoryofCondensedMatterPhysics,Institu
3、teofPhysics,ChineseAcademyofSciences;Abstract：Iron-basedsuperconductivityemergesfromthesuppressionoftheIong-rangedantiferromeigneticorderintheparentcompounds.Tosolvethemicroscopicmechanismofthesupcrconductivity，thekeyissueisfullyunderstandingabouttheevolutionofmagneticinteractionand
4、itsrelationshipbetweensuperconductivity.Here,wetaketheelectron-dopediron-basedsuperconductorBaFe2xNixAs2asatypicalexample,andsummarizetheneutronseatteringresultsontheelectronicphasediagram,magneticorderedstate,low-energyspinexcitationsandhigh-energyspinfluctuations,particularlyforth
5、eirsystematicevolutionversuselectrondopingsandtherecentprogressonthespinnematicity.Firstly,wewillintroduceaboutthecrystalstructureandmagneticstructure,detai1edprocedureofthesinglecrystalgrowthisalsopresented.Byfocusingonthestrueturaltransitiontemperature(Ts)andmagnetictransitiontemp
6、erature(Tjneartheoptimaldopinglevel,wehavefoundbothTsandTNvanishabovethesuperconductingtransitiontemperature(Tjasafirstordermanner,duetothelatticedistortionandmagneticallyorderedmomentdecreasebeyondthe1owerlimitoftheinstrumentrcsolution，givinganavoidquantumcriticalpointattheoptimald
7、oping.Inaddition,themagneticorderbecomesincommensurateandshort-rangedmagneticclusterandcompeteswithsuperconductingorder,suggestingstronginterplaybetweenmagnetismandsuperconductivity.Secondly,wewi11discussabouttheitineremtmagnetismandspinresonancemodeat1owenergyforspindynamics.Thespi
8、nresonancemodeiniro
