Effects of Cd vacancies and unconventional spin dynamics in the Dirac semimetal Cd3As2
2017-08-28
Source PublicationJOURNAL OF CHEMICAL PHYSICS
ISSN0021-9606
Volume147Issue:8
Status已发表
DOI10.1063/1.4999467
AbstractCd3As2 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.
Indexed BySCI ; EI
Language英语
Funding ProjectMRI program of the National Science Foundation[1532232]
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS IDWOS:000409143100036
PublisherAMER INST PHYSICS
EI Accession Number20173604116118
EI KeywordsGraphene ; Lattice vibrations ; Magic angle spinning ; Metalloids ; Narrow band gap semiconductors ; Nuclear magnetic resonance ; Temperature distribution
EI Classification NumberThermodynamics: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 KeywordBAND-STRUCTURE ; SOLID-STATE ; NMR ; CONDUCTION ; CRYSTAL
Original Document TypeArticle
Citation statistics
Document Type期刊论文
Identifierhttps://kms.shanghaitech.edu.cn/handle/2MSLDSTB/4645
Collection物质科学与技术学院_PI研究组_Dimitrios Koumoulis组
Corresponding AuthorKoumoulis, Dimitrios; Bouchard, Louis-S.
Affiliation
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
First Author AffilicationSchool of Physical Science and Technology
Corresponding Author AffilicationSchool of Physical Science and Technology
Recommended Citation
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).
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