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Persistent insulating state at megabar pressures in strongly spin-orbit coupled Sr2IrO4

文献类型：期刊论文

作者Chen, Chunhua2,7; Zhou, Yonghui2; Chen, Xuliang2; Han, Tao3; An, Chao3; Zhou, Ying2,7; Yuan, Yifang2,7; Zhang, Bowen2,7; Wang, Shuyang2,7; Zhang, Ranran2
刊名PHYSICAL REVIEW B
出版日期2020-04-15
卷号101
ISSN号2469-9950
DOI10.1103/PhysRevB.101.144102
通讯作者Zhou, Yonghui(yhzhou@hmfl.ac.cn)
英文摘要It is commonly anticipated that an insulating state will collapse in favor of an emergent metallic state at high pressures: The average electron density must increase with pressure, while the electronic bandwidth is expected to broaden and fill the insulating energy band gap. Here we report an unusually stable insulating state that persists up to at least 185 GPa in Sr2IrO4, the archetypical spin-orbit-driven J(eff) = 1/2 insulator. This study shows that the electrical resistance R of single-crystal Sr2IrO4 initially decreases with applied pressure P, reaches a minimum in the range 32-38 GPa, then abruptly rises to recover the insulating state with increasing P up to 185 GPa. However, evidence of a saturation of R below 80 K for P >= 124 GPa GPa raises the possibility of a low-temperature exotic state. Our synchrotron x-ray diffraction and Raman scattering data show the emergence of the rapid increase in R is accompanied by a structural phase transition from the native tetragonal I-41/acd phase to an orthorhombic Pbca phase (with much reduced symmetry) at 40.6 GPa. The clear correspondence of the onset pressures of these two anomalies is key to understanding the stability of the insulating state at megabar pressures: Pressure-induced, structural distortions prevent the expected onset of metallization, despite the sizable volume compression attained at the highest pressure accessed in this study.
WOS关键词SUPERCONDUCTIVITY ; DIFFRACTION ; HYDRIDE
资助项目National Key Research and Development Program of China[2018YFA0305700] ; National Key Research and Development Program of China[2016YFA0401804] ; National Natural Science Foundation of China (NSFC)[11574323] ; National Natural Science Foundation of China (NSFC)[U1632275] ; National Natural Science Foundation of China (NSFC)[11874362] ; National Natural Science Foundation of China (NSFC)[11804344] ; National Natural Science Foundation of China (NSFC)[U1832209] ; National Natural Science Foundation of China (NSFC)[11704387] ; Users with Excellence Project of Hefei Science Center CAS[2018HSCUE012] ; Major Program of Development Foundation of Hefei Center for Physical Science and Technology[2018ZYFX002] ; Youth Innovation Promotion Association CAS[2020443] ; US National Science Foundation[DMR 1712101] ; US National Science Foundation[1903888] ; U.S. National Science Foundation[DMR-1506979]
WOS研究方向Materials Science ; Physics
语种英语
WOS记录号WOS:000525841000002
出版者AMER PHYSICAL SOC
资助机构National Key Research and Development Program of China ; National Natural Science Foundation of China (NSFC) ; Users with Excellence Project of Hefei Science Center CAS ; Major Program of Development Foundation of Hefei Center for Physical Science and Technology ; Youth Innovation Promotion Association CAS ; US National Science Foundation ; U.S. National Science Foundation
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/103697]  
专题中国科学院合肥物质科学研究院
通讯作者Zhou, Yonghui
作者单位1.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
2.Chinese Acad Sci, High Magnet Field Lab, Anhui Prov Key Lab Condensed Matter Phys Extreme, Hefei 230031, Peoples R China
3.Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China
4.Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
5.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
6.Univ Colorado, Dept Phys, Boulder, CO 80309 USA
7.Univ Sci & Technol China, Grad Sch, Sci Isl Branch, Hefei 230026, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Chunhua,Zhou, Yonghui,Chen, Xuliang,et al. Persistent insulating state at megabar pressures in strongly spin-orbit coupled Sr2IrO4[J]. PHYSICAL REVIEW B,2020,101.
APA Chen, Chunhua.,Zhou, Yonghui.,Chen, Xuliang.,Han, Tao.,An, Chao.,...&Cao, Gang.(2020).Persistent insulating state at megabar pressures in strongly spin-orbit coupled Sr2IrO4.PHYSICAL REVIEW B,101.
MLA Chen, Chunhua,et al."Persistent insulating state at megabar pressures in strongly spin-orbit coupled Sr2IrO4".PHYSICAL REVIEW B 101(2020).

入库方式： OAI收割

来源：合肥物质科学研究院

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