物理学报2024，Vol.73Issue(19)：167-187,21.DOI:10.7498/aps.73.20241080
铁基超导研究中的单轴应变调控方法
Uniaxial-strain tuning method in study of iron-based superconductors
摘要
Abstract
In the study of quantum materials,introducing pressure and strain that can change lattice parameters and symmetry is an effective experimental method for manipulating the electronic properties of the system.In measurements under hydrostatic pressure or in-plane epitaxial strain,the changes in lattice parameters will lead to significant changes in the electronic structure,thereby triggering off novel quantum phenomena and phase transitions.By comparison,the in-plane uniaxial strain,which has been widely employed in recent years,not only changes lattice parameters,but also directly destroys and controls the symmetry of the system,thereby affecting the electronic ordering state and even collective excitation of the system.This article provides a comprehensive overview of the basic concepts of uniaxial strain,the development of experimental methods,and some research progress in using these methods to regulate superconductivity and electronic nematicity in iron-based superconductors.This review contains six sections.Section 1 focuses on a genetral introduction for the uniaxial strain techque and the arrangement of this paper.Section 2 is devoted to the basic concepts and formulas related to elastic moduli and the decomposition of uniaxial strain into irreducible symmetric channels under D4h point group.Section 3 gives iron-based superconductors(FeSCs)and discusses the uniaxial-pressure detwinning method and related research progress.Section 4 introduces the establishment of the elastoresistance as a probe of the nematic susceptibility and discusses the key researches in this direction.Section 5 describes the research progress of the effects of uniaxial strain on superconductivity and nematicity.In sections 4 and 5,key experimental techniques,such as elastoresistance,are discussed in detail.Section 6 extends the discussion to several types of quantum materials suitable for uniaxial-strain tuning method beyond the FeSCs.Finally,we provide a brief summary and outlook on the uniaxial strain tuning technique.Overall,this review article provides valuable resources for the beginners in the field of FeSC and those who are interested in using uniaxial strain to modulate the electronic properties of quantum materials.By summarizing recent advancements and experimental techniques,this review hopes to inspire further research and innovation in studying electronic materials under uniaxial strain.关键词
强关联电子/铁基超导/单轴应变/弹性电阻系数Key words
strongly correlated electron/iron-based superconductors/spin excitations/uniaxial strain引用本文复制引用
李春熠,莫子夜,鲁兴业..铁基超导研究中的单轴应变调控方法[J].物理学报,2024,73(19):167-187,21.基金项目
中央高校基本科研业务费专项资金(批准号:2243300003)、国家重点基础研究发展计划(批准号:2021YFA1400401)和国家自然科学基金(批准号:12174029,11922402)资助的课题. Project supported by the Fundamental Research Funds for the Central Universities(Grant No.2243300003),the National Key Projects for Research and Development of China(Grant No.2021YFA1400401),and the National Natural Science Foundation of China(Grant Nos.12174029,11922402). （批准号:2243300003）
