摘要
文章回顾了用中子散射技术对铁基超导体中所存在的三维长程反铁磁序进行研究的进展.大多数铁基超导体母体的晶体结构在温度降低时都经历了从四方相变化到正交相或单斜相的结构相变.在此相变温度之下,自旋系统也从顺磁变化到三维长程反铁磁.在掺杂之后,结构相变和磁相变都被压制,而超导则最终出现.文章详细介绍了各种母体中的三维反铁磁结构及其自旋波频谱,并讨论了掺杂对反铁磁相变和晶格相变的影响.
We review neutron scattering studies on the long-range antiferromagnetism in Fe-based superconductors. On cooling from room temperature, most parent compounds of these materials exhibit a tetragonal to orthorhombic/monoclinie structural transition. The system also changes from paramagnetism to a long-range antiferromagnetism. Doping holes or electrons suppresses both transitions and leads to the appearance of superconductivity. We describe the structure and spin wave spectra of various undoped materials, and discuss how the structural and magnetic transitions are affected by the doping.
出处
《物理》
CAS
北大核心
2009年第9期644-650,共7页
Physics
基金
美国国家自然科学基金(批准号:DMR-0756568)
美国能源部基础能源科学研究基金(批准号:DE-FG02-05FR46202)
中国科学院资助项目
关键词
铁基超导体
中子散射
反铁磁
Fe-based superconductors, neutron scattering, antiferromagnetism
