CAS OpenIR  > 中科院上海应用物理研究所2011-2020年
Lattice distortion and electronic structure of BaAg2As2 across its nonmagnetic phase transition
Lou, X; Xu, HC; Wen, CHP; Yu, TL; Wei, WZ; Yao, Q; Song, YH; Emmanouilidou, E; Shen, B; Ni, N; Dudin, P; Huang, YB; Denlinger, J; Sutarto, R; Li, W; Peng, R; Feng, DL
2020
Source PublicationPHYSICAL REVIEW B
ISSN2469-9950
Volume101Issue:7Pages:-
Subtype期刊论文
AbstractBaAg2As2, a sibling compound of BaFe2As2 with a nonmagnetic phase transition around 150 K, is studied by the comprehensive measurements of angle-resolved photoemission spectroscopy, synchrotron x-ray diffraction, and resonant soft x-ray scattering. The Fermi surfaces and electronic structure of BaAg2As2 are revealed, with strong k(z), dispersion, consistent with the strongly contracted c/a ratio in BaAg2As2. Across the phase transition, splitting of [101] Bragg peak is observed, showing a structural distortion with the in-plane distortion magnitude delta = vertical bar a - b vertical bar/(a + b) = 0.0052. Although the nesting condition is satisfied in some parallel Fermi-surface sectors, there is no signature of charge density wave order at the nesting wave vector. Moreover, neither a charge density wave gap opening nor band reconstruction are observed across the phase transition. Instead, an enhancement on the spectral weight of dispersive bands is observed across the structural phase transition, which can explain the sharp drop of resistivity below the phase transition temperature. These studies could enrich the understanding of the variable and common features of the structural transition in transition metal pnictide layered materials.
KeywordFERMI-SURFACE SPECTROSCOPY CRYSTAL
DOI10.1103/PhysRevB.101.075123
Indexed BySCI ; EI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/32974
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Fudan Univ, State Key Lab Surface Phys, Adv Mat Lab, Shanghai 200433, Peoples R China
2.Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
3.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
4.Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA
5.Harwell Sci & Innovat Campus, Diamond Light Source, Didcot OX11 0DE, Oxon, England
6.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
7.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
8.Canadian Light Source, Saskatoon, SK S7N 2V3, Canada
9.Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
10.Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, CAS Ctr Excellence Quantum Informat & Quantum Phy, Hefei 230026, Peoples R China (1
11.Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Lou, X,Xu, HC,Wen, CHP,et al. Lattice distortion and electronic structure of BaAg2As2 across its nonmagnetic phase transition[J]. PHYSICAL REVIEW B,2020,101(7):-.
APA Lou, X.,Xu, HC.,Wen, CHP.,Yu, TL.,Wei, WZ.,...&Feng, DL.(2020).Lattice distortion and electronic structure of BaAg2As2 across its nonmagnetic phase transition.PHYSICAL REVIEW B,101(7),-.
MLA Lou, X,et al."Lattice distortion and electronic structure of BaAg2As2 across its nonmagnetic phase transition".PHYSICAL REVIEW B 101.7(2020):-.
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