Coupled commensurate charge density wave and lattice distortion in Na(2)Ti(2)Pn(2)O (Pn = As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy

doi:10.1103/PhysRevB.94.104515

	Coupled commensurate charge density wave and lattice distortion in Na(2)Ti(2)Pn(2)O (Pn = As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy
	Davies, N. R.1; Johnson, R. D.1; Princep, A. J.1; Gannon, L. A.1; Ma, J. -Z.2,3; Qian, T.2,4; Richard, P.2,4; Li, H.2; Shi, M.3; Nowell, H.5; Baker, P. J.6; Shi, Y. G.2; Ding, H.2,4; Luo, J.2; Guo, Y. F.1,7 ; Boothroyd, A. T.1
	2016-09-19
发表期刊	PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year])
ISSN	2469-9950
卷号	94 期号:10
发表状态	已发表
DOI	10.1103/PhysRevB.94.104515
摘要	We report single-crystal x-ray-diffraction measurements on Na(2)Ti(2)Pn(2)O (Pn = As,Sb) which reveal a charge superstructure that appears below the density wave transitions previously observed in bulk data. From symmetry-constrained structure refinements we establish that the associated distortion mode can be described by two propagation vectors q(1) = (1/2,0,l) and q(2) = (0,1/2,l) with l = 0 (Sb) or l = 1/2 (As) and primarily involves in-plane displacements of the Ti atoms perpendicular to the Ti-O bonds. We also present angle-resolved photoemission spectroscopy measurements, which show band folding and backbending consistent with a density wave with the same wave-vectors q(1) and q(2) associated with Fermi-surface nesting, and muon-spin relaxation data, which show no indication of spin density wave order. The results provide direct evidence for phonon-assisted charge density wave order in Na(2)Ti(2)Pn(2)O and fully characterize a proximate ordered phase that could compete with superconductivity in doped BaTi2Sb2O.
收录类别	SCI
语种	英语
资助项目	Engineering and Physical Sciences Research Council[1659737] ; Engineering and Physical Sciences Research Council[EP/J012912/1] ; Engineering and Physical Sciences Research Council[EP/J017124/1]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000383858300004
出版者	AMER PHYSICAL SOC
WOS关键词	LAYERED PNICTIDE-OXIDES ; ELECTRONIC-STRUCTURE ; SUPERCONDUCTIVITY ; NA2TI2SB2O ; ORDER ; SB ; TRANSITION
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/1707
专题	物质科学与技术学院_PI研究组_郭艳峰组
通讯作者	Guo, Y. F.; Boothroyd, A. T.
作者单位	1.Univ Oxford, Clarendon Lab, Dept Phys, Oxford OX1 3PU, England 2.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 3.Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland 4.Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China 5.Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England 6.STFC Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England 7.ShanghaiTech Univ, Sch Phys Sci & Technol, 319 Yueyang Rd, Shanghai 200031, Peoples R China
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Davies, N. R.,Johnson, R. D.,Princep, A. J.,et al. Coupled commensurate charge density wave and lattice distortion in Na(2)Ti(2)Pn(2)O (Pn = As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy[J]. PHYSICAL REVIEW B,2016,94(10).
APA	Davies, N. R..,Johnson, R. D..,Princep, A. J..,Gannon, L. A..,Ma, J. -Z..,...&Boothroyd, A. T..(2016).Coupled commensurate charge density wave and lattice distortion in Na(2)Ti(2)Pn(2)O (Pn = As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy.PHYSICAL REVIEW B,94(10).
MLA	Davies, N. R.,et al."Coupled commensurate charge density wave and lattice distortion in Na(2)Ti(2)Pn(2)O (Pn = As,Sb) determined by x-ray diffraction and angle-resolved photoemission spectroscopy".PHYSICAL REVIEW B 94.10(2016).