Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2

doi:10.1063/1.4999467

KMS > 物质科学与技术学院 > PI研究组 > Dimitrios Koumoulis组

	Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2
	Koumoulis, Dimitrios1,5 ; Taylor, Robert E.1; McCormick, Jeffrey 1; Ertas, Yavuz N.2; Pan, Lei 3; Che, Xiaoyu 3; Wang, Kang L.3; Bouchard, Louis-S.1,4
	2017-08-28
发表期刊	JOURNAL OF CHEMICAL PHYSICS
ISSN	0021-9606
卷号	147 期号:8
发表状态	已发表
DOI	10.1063/1.4999467
摘要	Cd3As2 is a Dirac semimetal that is a 3D analog of graphene. We investigated the local structure and nuclear-spin dynamics in Cd3As2 via Cd-113 NMR. The wideline spectrum of the static sample at 295K is asymmetric and its features are well described by a two-site model with the shielding parameters extracted via Herzfeld-Berger analysis of the magic-angle spinning spectrum. Surprisingly, the Cd-113 spin-lattice relaxation time (T-1) is extremely long (T-1 = 95 s at 295 K), in stark contrast to conductors and the effects of native defects upon semiconductors; but it is similar to that of C-13 in graphene (T-1 = 110 s). The temperature dependence of 1/T-1 revealed a complex bipartite mechanism that included a T-2 power-law behavior below 330 K and a thermally activated process above 330 K. In the high-temperature regime, the Arrhenius behavior is consistent with a field-dependent Cd atomic hopping relaxation process. At low temperatures, a T-2 behavior consistent with a spin-1/2 Raman-like process provides evidence of a time-dependent spin-rotation magnetic field caused by angular oscillations of internuclear vectors due to lattice vibrations. The observed mechanism does not conform to the conventional two-band model of semimetals, but is instead closer to a mechanism observed in high-Z element ionic solids with large magnetorotation constant [A.J. Vega et al., Phys. Rev. B 74, 214420 (2006)/. Published by AIP Publishing.
收录类别	SCI ; EI
语种	英语
资助项目	MRI program of the National Science Foundation[1532232]
WOS研究方向	Chemistry ; Physics
WOS类目	Chemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS记录号	WOS:000409143100036
出版者	AMER INST PHYSICS
EI入藏号	20173604116118
EI主题词	Graphene ; Lattice vibrations ; Magic angle spinning ; Metalloids ; Narrow band gap semiconductors ; Nuclear magnetic resonance ; Temperature distribution
EI分类号	Thermodynamics:641.1 ; Nanotechnology:761 ; Chemical Products Generally:804 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Atomic and Molecular Physics:931.3 ; Crystal Lattice:933.1.1
WOS关键词	BAND-STRUCTURE ; SOLID-STATE ; NMR ; CONDUCTION ; CRYSTAL
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/4645
专题	物质科学与技术学院_PI研究组_Dimitrios Koumoulis组
通讯作者	Koumoulis, Dimitrios; Bouchard, Louis-S.
作者单位	1.Univ Calif Los Angeles, Dept Chem & Biochem, 607 Charles E Young Dr East, Los Angeles, CA 90095 USA 2.Univ Calif Los Angeles, Dept Bioengn, 420 Westwood Plaza, Los Angeles, CA 90095 USA 3.Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA 4.Univ Calif Los Angeles, Calif NanoSyst Inst, 570 Westwood Plaza, Los Angeles, CA 90095 USA 5.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Koumoulis, Dimitrios,Taylor, Robert E.,McCormick, Jeffrey,et al. Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2[J]. JOURNAL OF CHEMICAL PHYSICS,2017,147(8).
APA	Koumoulis, Dimitrios.,Taylor, Robert E..,McCormick, Jeffrey.,Ertas, Yavuz N..,Pan, Lei.,...&Bouchard, Louis-S..(2017).Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2.JOURNAL OF CHEMICAL PHYSICS,147(8).
MLA	Koumoulis, Dimitrios,et al."Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2".JOURNAL OF CHEMICAL PHYSICS 147.8(2017).