Unveiling the mechanisms of metal-insulator transitions in V2O3: The role of trigonal distortion

doi:10.1103/PhysRevB.103.085119

	Unveiling the mechanisms of metal-insulator transitions in V2O3: The role of trigonal distortion
	Hu, L.1; Xie, C.1,2,3; Zhu, S. J.1; Zhu, M.1; Wei, R. H.1; Tang, X. W.1; Lu, W. J.1; Song, W. H.1; Dai, J. M.1; Zhang, R. R.4
刊名	PHYSICAL REVIEW B
	2021-02-12
卷号	103
ISSN号	2469-9950
DOI	10.1103/PhysRevB.103.085119
通讯作者	Zhu, X. B.(xbzhu@issp.ac.cn)
英文摘要	The mechanisms underlying the paramagnetic metal to paramagnetic insulator (PM-PI) and anti-ferromagnetic insulator (PM-AFT) transitions in the archetypical correlated oxide of V2O3 are long-standing yet not completely resolved topics in condensed matter physics. Herein, utilizing large differences of thermal expansion coefficient between V2O3 and Al2O3, a large variation of trigonal distortion in a continuous way is realized in pure V2O3 thin films grown on c-plane Al2O3 substrates by changing the substrate temperature during deposition. The PM-PI transition is successfully reproduced in pure V2O3 thin films through enhancing trigonal distortion. Furthermore, the PM phase cannot be taken for granted to exhibit identical orbital occupations and consequently, play a negligible role in triggering the PM-AFI transitions. Instead, the a(1g) orbital occupation gauged by the A(1g) phonon mode in the PM phase strongly varies with the trigonal distortion and directly determines the PM-AFI transition characteristics. Our findings unambiguously demonstrate the essential role of trigonal distortion for understanding the multiple metal-insulator transitions and open up an opportunity for manipulating them by trigonal distortion in V2O3.
资助项目	National Key R&D Program of China[2017YFA0403600] ; National Natural Science Foundation of China[U1532149] ; National Natural Science Foundation of China[U1932217] ; Chinese Academy of Sciences Large-Scale Scientific Facility[U1532149] ; Chinese Academy of Sciences Large-Scale Scientific Facility[U1932217]
WOS研究方向	Materials Science ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000617789900002
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences Large-Scale Scientific Facility
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/120218]
专题	中国科学院合肥物质科学研究院
通讯作者	Zhu, X. B.
作者单位	1.Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, HFIPS, Hefei 230031, Peoples R China 2.Anhui Univ, Inst Phys Sci, Hefei 230601, Peoples R China 3.Anhui Univ, Inst Informat Technol, Hefei 230601, Peoples R China 4.Chinese Acad Sci, High Magnet Field Lab, HFIPS, Hefei 230031, Peoples R China 5.Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Hu, L.,Xie, C.,Zhu, S. J.,et al. Unveiling the mechanisms of metal-insulator transitions in V2O3: The role of trigonal distortion[J]. PHYSICAL REVIEW B,2021,103.
APA	Hu, L..,Xie, C..,Zhu, S. J..,Zhu, M..,Wei, R. H..,...&Sun, Y. P..(2021).Unveiling the mechanisms of metal-insulator transitions in V2O3: The role of trigonal distortion.PHYSICAL REVIEW B,103.
MLA	Hu, L.,et al."Unveiling the mechanisms of metal-insulator transitions in V2O3: The role of trigonal distortion".PHYSICAL REVIEW B 103(2021).